WATER QUALITY REPORT REPORT FOR 2020 DATA
Our Drinking Water is Safe! The City of Southlake’s goal is to provide you with safe and reliable drinking water. We are happy to report that our water meets the safe drinking water quality standards as set by the U.S. Environmental Protection Agency (EPA) and the Texas Commission on Environmental Quality (TCEQ). This report is a summary of the quality of the water we provided to you in 2020. Para ver este informe en español, por favor dirijase a la pagina 15.
3 A Guide to Your Water Quality 4 How to Read Your Water Quality Report Data 5 Southlake’s Water Source; Water Loss 6 Microorganisms; Lead & Copper Testing; Corrosion Control 7 Regulated Contaminants 8 Regulated Contaminants – Continued 9 Funny Taste or Smell?; Secondary Constituents 10 Unregulated Contaminant Monitoring in 2020 11 Unregulated Contaminant Monitoring in 2020 – Continued 12 Maintaining Southlake’s Water Storage Tanks 13 Water Conservation 14 Be the Solution to Stormwater Pollution 15 Let’s Talk About It; Eye on Water
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CITY OF SOUTHLAKE | WATER QUALITY REPORT 2021
A Guide to Your Water Quality This report is a summary of the quality of water we provided to our customers in 2020. Data found in the following pages was obtained from sampling protocols, as defined by the Environmental Protection Agency (EPA).
Definitions and Abbreviations AL: Action level; The concentration of a contaminant, which, if exceeded, triggers treatment or other requirements that a water system must follow. Level 1 Assessment: A Level 1 assessment is a study of the water system to identify potential problems and determine (if possible) why total coliform bacteria were found.
There is evidence that addition of a disinfectant is necessary for control of microbial contaminants. MRDLG: Maximum Residual Disinfectant Level Goal; the level of a drinking water disinfectant below which there are no known or expected health risks. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.
Level 2 Assessment: A Level 2 assessment is a very detailed study of the water system to identify potential problems and determine (if possible) why an Escherichia coli (E. coli) maximum contaminant level (MCL) violation has occurred and/or why total coliform bacteria were found on multiple occasions.
MRL: Minimum Reporting Level; the lowest concentration of a constituent or a contaminant that can be measured by a laboratory.
MCL: Maximum Contaminant Level; the highest level of a contaminant allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
NTU: Nepholomeric Turbidity Units; a measure of water turbidity or clarity.
MCLG: Maximum Contaminant Level Goal; the level of a contaminant in drinking water below which there is no known or expected health risks. MCLGs allow for a margin of safety. MRDL: Maximum Residual Disinfectant Level; the highest level of disinfectant allowed in drinking water.
WATER QUALITY REPORT 2021 | CITY OF SOUTHLAKE
N/A: Data field not applicable to the particular constituent we are reporting information about.
pCi/L: Picocuries per Liter; a measure of radioactivity. ppb: Parts per Billion or micrograms per liter (µg/L). ppm: Parts per Million or milligrams per liter (mg/L). TT: Treatment Technique; a required process intended to reduce the level of a contaminant in drinking water.
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The City of Southlake monitors water quality daily, including sampling, flushing, and checking chlorine residuals.
View the report online here:
www.CityofSouthlake.com/WaterQuality
How to Read Your Water Quality Report This Consumer Confidence Report is a summary of the constituents that are in your drinking water and how these constituents may affect your health, if found in excess of safe drinking water quality standards. This quick reference may help you to better understand the information provided in the rest of this report. The amount, from lowest to highest, of this contaminant detected in our drinking water last year. Parts per million is equal
to one teaspoon in 1,302 gallons.
Below this level, a contaminant has no known or expected health risks.
Measure
2020 Level
Range of Detects
MCL
MCLG
Common Source of Substance
Substance 1
ppm
0.5
0.02-0.11
2
2
Discharge from drilling wastes, discharge from metal refineries
Substance 2
ppb
8.4
2.4-8.4
100
100
Erosion of natural deposits
Contaminant
Parts per billion is equal to one teaspoon in 1,302,000 gallons.
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The highest amount of a contaminant EPA allows in drinking water.
The average amount of this contaminant detected in our drinking water last year.
This describes some of the ways contaminants enter drinking water; wording is provided by EPA and may or may not apply to the City of Southlake.
CITY OF SOUTHLAKE | WATER QUALITY REPORT 2021
Southlake’s Water Source The City of Southlake gets all of its water from the City of Fort Worth’s Water Department. Fort Worth obtains water from surface water sources: Lake Worth, Eagle Mountain Lake, Lake Bridgeport, Richland Chambers Reservoir, Cedar Creek Reservoir, and the Clear Fork Trinity River (from Lake Benbrook). Fort Worth owns Lake Worth. The U.S. Army Corps of Engineers is responsible for Lake Benbrook. The other four lakes are owned and operated by Tarrant Regional Water District (TRWD).
TCEQ ASSESSES RAW WATER SUPPLIES The Texas Commission on Environmental Quality (TCEQ) completed an assessment of Fort Worth’s, and subsequently, Southlake’s source waters. TCEQ classified the risk to our source waters as high for most contaminants. High susceptibility means there are activities near the source water watershed that make it very likely chemical constituents may come into contact with the source water. It does not mean there are any health risks present. TRWD, from which Southlake ultimately purchases its water, received the assessment reports. For more information on source water assessments and protection efforts at our system, contact Southlake Water Utilities at 817-748-8082. Further details about the source water assessments are available at www.tceq.texas.gov/gis/swaview.
Further details about sources and source water assessments are available through the Texas Commission on Environmental Quality at www.tceq.texas.gov/drinkingwater.
Water Loss, as Reported to the Texas Water Development Board Every year the City of Southlake is required to report water loss to the Texas Water Development Board (TWDB). This is non-metered water used in fire hydrant protection, water line flushing for health and safety, and other activities. Water loss also includes water lost to leaks, line breaks, and other uncontrollable flow. We reported a loss of approximately 12 gallons per water account in 2020. One of the most important tools in accurately measuring water loss and ensuring accurate utility billing is the water meters throughout the City. The large production meters that measure the incoming water purchased from the City of Fort Worth are tested and calibrated at least once per year. The Southlake Water Utilities’ goal is to conform to the American Water Works Association (AWWA) meter accuracy standard of 98.5% to 101.5%.
Trinity River Authority of Texas Tarrant Water Supply Project In accordance with the requirements of §290.272. Content of the Report. (g)(6) “Systems that use an interconnect or emergency source to augment the drinking water supply during the calendar year of the report must provide the source of the water, the length of time used, an explanation of why it was used, and whom to call for the water quality information.” The City of Fort Worth did not utilize an emergency interconnection in 2020.
WATER QUALITY REPORT 2021 | CITY OF SOUTHLAKE
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Microorganism Testing Shows Low Detections in Raw Water Tarrant Regional Water District monitors the raw water at all intake sites for Cryptosporidium, Giardia lamblia and viruses. The source is human and animal fecal waste in the watershed. The 2020 sampling showed low level detections of Cryptosporidium, Giardia lamblia and viruses in some but not all of the water supply sources. Viruses are treated through disinfection processes. Cryptosporidium and Giardia Lamblia are removed through disinfection and/or filtration.
Viruses are treated through disinfection processes. Cryptosporidium and Giardia Lamblia are removed through disinfection and/or filtration.
You may be more vulnerable than the general population to certain microbial contaminants, such as Cryptosporidium, in drinking water. Infants, some elderly, or immuno-compromised persons, such as those undergoing chemotherapy for cancer; those who have undergone organ transplants; those who are undergoing treatment with steroids; and people with HIV/AIDS or other immune system disorders can be particularly at risk from infections. You should seek advice about drinking water from your physician or health care provider. Additional guidelines on appropriate ways to lessen the risk of infection by Cryptosporidium are available from the Safe Drinking Water Hotline.
Lead and Copper Testing If present, elevated levels of lead can lead to serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and private plumbing. The City of Southlake is responsible for providing high quality drinking water, but cannot control the variety of materials used in plumbing components. If you haven’t turned on any faucets in several hours, you can minimize the potential for lead exposure by flushing your tap for 30 seconds to two minutes before using the water for drinking or cooking. Never use hot water from the tap for cooking or preparing infant formula. Measure
Action Level
90th Percentile
# Sites Over Action Level
MCLG
Violation
Common Source of Substance
Copper
ppm
1.3
0.76
0
1.3
No
Erosion of natural deposits; leaching from wood preservatives; corrosion of household plumbing systems
Lead
ppb
15
2.9
0
0
No
Corrosion of household plumbing systems; erosion of natural deposits
Contaminant
If you are concerned about lead in your water, you may request to have your water tested through the City of Southlake Public Works Department. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline 1-800-426-4791 or at www.epa.gov/safewater/lead.
Corrosion Control To meet the requirements of the Lead and Copper Rule, Fort Worth achieves corrosion control through pH adjustment.
The City of Southlake has four water towers (called elevated storage tanks) and three pump stations (ground storage tanks). Have you spotted them all?
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CITY OF SOUTHLAKE | WATER QUALITY REPORT 2021
Did you know you can sign up for a free account that will let you view your hourly water usage? Check out page 15 of this report for more information.
Regulated Contaminants Tested in 2020 Measure
2020 Level
MCL
MCLG
Violation
Common Source of Substance
NTU
0.3 99.9%
TT = 1 (TT = lowest monthly % of samples ≤ 0.3 NTU)
N/A
No
Soil runoff (Turbidity is a measure of the cloudiness of water. It is an indicator of the effectiveness of the filtration system.)
Measure
2020 Level
Range of Detects
MRDL
MRDLG
Violation
Common Source of Substance
ppm
3.5
1 to 11
4
4
No
Water additive used to control microbes
Measure
2020 Level
Range of Detects
MCL
MCLG
Violation
Common Source of Substance
Bromate
ppb
4.79
0 to 11.4
10
0
No
By-product of drinking water disinfection
Haloacetic Acids (HAA5)
ppb
10.6
3 to 23
60
N/A
No
By-product of drinking water disinfection
Total Trihalomethanes
ppb
21.0
1.37 to 56
80
N/A
No
By-product of drinking water disinfection
Contaminant
MCL
MCLG
High
Low
Average
Violation
Common Source of Substance
TT = % removal
N/A
1
1
1
No
Naturally occurring
Contaminant
Turbidity
Contaminant Chloramines
Contaminant
Total Organic Carbon
Contaminant
Coliforms
Highest # of Positives
Total # of Positives of Fecal Coliform or E. coli Samples
Total Coliform MCL
Total Coliform MCLG
Fecal Coliform or E. coli MCLG
Violation
Likely Source of Contamination
0
0
No more than 5% of monthly samples collected test positive.
0
0
No
Naturally present in the environment
WATER QUALITY REPORT 2021 | CITY OF SOUTHLAKE
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Regulated Contaminants Tested in 2020 Contaminant
Measure
2020 Level
Range of Detects
MCL
MCLG
Violation
Common Source of Substance
pCi/L
6.8
0 to 6.8
50
0
No
Decay of natural and man-made deposits of certain minerals that are radioactive and may emit forms of radiation known as photons and beta radiation
Arsenic
ppb
1.5
0 to 1.5
10
0
No
Erosion of natural deposits; runoff from orchards; runoff from glass and electronics production wastes
Atrazine
ppb
0.1
0 to 0.1
3
3
No
Runoff from herbicide used on row crops
Barium
ppm
0.06
0.05 to 0.06
2
2
No
Discharge of drilling wastes; discharge from metal refineries; erosion of natural deposits
Chromium
ppb
3.3
0 to 3.3
100
100
No
Erosion of natural deposits; discharge from steel and pulp mills
Cyanide
ppb
159
0 to 159
200
200
No
Discharge from plastic and fertilizer factories; discharge from steel and metal factories
4
4
No
Water additive to promote strong teeth; erosion of natural deposits; discharge from fertilizer and aluminum factories
Beta particles and photon emitters
Fluoride
ppm
.52
0.15 to 0.52
Nitrate (measured as Nitrogen)
ppm
.49
0.19 to 0.58
10
10
No
Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits
Nitrite (measured as Nitrogen)
ppm
.02
0.01 to 0.02
1
1
No
Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits
The average Southlake resident used 191 gallons of water per day in 2020.
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CITY OF SOUTHLAKE | WATER QUALITY REPORT 2021
Funny Taste or Smell? Occasionally, water suppliers experience episodes of unpleasant odors and tastes in the water, often characterized as “earthy” or “musty.” These taste and odor variations are caused by naturally-occurring algae growth in one source of your drinking water, such as Eagle Mountain Lake. The compounds that cause this particular taste and smell do not pose any health risks. Other constituents, which are often found in drinking water, can also cause taste, color, and odor. These secondary constituents are not causes for health concern. We report information about these secondary constituents to help you in making a determination about the taste, odor, and appearance of your water. These items do not relate to public health but rather to the aesthetic effects. These items are often important to industry. Item
Measure
Your Water
Bicarbonate
ppm
108 to 131
Calcium
ppm
37.9 to 50.8
Chloride
ppm
19.3 to 37.6
µmhos/ cm
324 to 440
pH
units
8.2 to 8.4
Magnesium
ppm
4.24 to 8.12
Sodium
ppm
18 to 26.9
Sulfate
ppm
20.6 to 36.5
Total Alkalinity as CaCO3
ppm
108 to 131
Total Dissolved Solids
ppm
181 to 277
Total Hardness as CaCO3
ppm
112 to 160
Total Hardness in Grains
grains/ gallon
7 to 9
Conductivity
Residential leaks accounted for over 130,000,000 gallons of water loss in 2020.
WATER QUALITY REPORT 2021 | CITY OF SOUTHLAKE
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Unregulated Contaminant Monitoring in 2020 Unregulated contaminants are those for which the EPA has not established drinking water standards. The purpose of unregulated contaminant monitoring is to assist the EPA in determining the occurrence of unregulated contaminants in drinking water and whether future regulation is warranted. Because these contaminants are not regulated there is not a Maximum Contaminant Level or Maximum Contaminant Level Goal. The City of Forth Worth did not perform unregulated contaminant monitoring in 2020. Southlake’s testing detected one metal and three haloacetic acid disinfection byproduct groups. Measure
Average
Highest Level Detected
Range of Detects
Common Source of Substance
Manganese
ppb
2.505
4.4
0.92 to 4.4
Naturally occurring; used in drinking water and waste-water treatment; used in steel production, fertilizer, batteries, and fireworks
HAA5 (Haloacetic acid)
ppb
N/A
9
5 to 9.8
HAA6Br (Haloacetic acid)
ppb
6.125
6.67
5 to 6.67
HAA9 (Haloacetic acid)
ppb
11.85
15.57
10.3 to 15.57
Compound
By-product of drinking water disinfection
HALOACETIC ACID GROUPS This table includes all of the compounds that comprise each of the haloacetic acid groups. Compounds that are not detected are usually not listed in the charts in this report; however, those undetected are listed below to provide complete information on the compounds that comprise each of the three groups in the table above. Measure
MRDLG
Average
Range of Detects
Bromoform
ppb
0
0
0
Bromodichloromethane
ppb
0
1.88
1.18 to 2.53
Chloroform
ppb
70
2.48
1.47 to 3.99
Dibromochloromethane
ppb
60
1.33
0 to 1.44
Dibromoacetic Acid
ppb
N/A
1.36
1.00 to 1.90
Dichloroacetic Acid
ppb
0
5.13
3.90 to 6.60
Monobromoacetic Acid
ppb
N/A
0
0 to 1.10
Monochloroacetic Acid
ppb
70
1.43
0 to 2.00
Trichloroacetic Acid
N/A
20
0
0
Compound
Common Source of Substance
By-products of drinking water disinfection; not regulated individually; included in Total Trihalomethanes
By-products of drinking water disinfection; not regulated individually; included in Haloacetic Acids
EPA gathers data to decide if future regulation is necessary Water utilities in the United States monitor for more than 100 contaminants and must meet 91 regulations for water safety and quality. Should other contaminants be regulated? The 1996 Safe Drinking Water Act amendments require that once every five years the EPA issues a new list of up
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to 30 unregulated contaminants to be monitored by public water systems. Unregulated contaminants are those for which EPA has not established drinking water standards. The purpose of unregulated contaminant monitoring is to assist EPA in determining the occurrence of unregulated contaminants
CITY OF SOUTHLAKE | WATER QUALITY REPORT 2021
The City of Southlake maintains 11,178 meters, 7,850 valves, and 2,862 fire hydrants, plus over 300 miles of water line pipes.
Unregulated Contaminant Monitoring in 2020 Measure
MRDL
MRDLG
Your Water
Range of Detects
Bromoform
ppb
Not regulated
0.0
8.5
0 to 3.53
Bromodichloromethane
ppb
Not regulated
0.0
2.93
3.18 to 17.5
Chloroform
ppb
Not regulated
70
3.05
3.10 to 24.7
Dibromochloromethane
ppb
Not regulated
60
2.73
1.59 to 11.8
Dibromoacetic Acid
ppb
Not regulated
N/A
1.33
1.7 to 3
Dichloroacetic Acid
ppb
Not regulated
0.0
4.11
4.20 to 11
Monobromoacetic Acid
ppb
Not regulated
N/A
0.02
0 to 1
Monochloroacetic Acid
ppb
Not regulated
70
0.49
1 to 5
Trichloroacetic Acid
ppb
Not regulated
20
0.1
0 to 5
Contaminant
in drinking water and whether future regulation is warranted. The fourth Unregulated Contaminant Monitoring Rule includes assessment for three brominated haloacetic acid groups, 10 cyanotoxins, two metals, three semi-volatile chemicals, three alcohols, eight pesticides and one pesticide manufacturing byproduct. The rule requires testing for cyanotoxins in four consecutive months. Fort Worth tested from August
WATER QUALITY REPORT 2021 | CITY OF SOUTHLAKE
Common Source of Substance By-product of drinking water disinfection; not regulated individually; included in Total Trihalomethanes
By-product of drinking water disinfection; not regulated individually; included in Haloacetic Acids
through November 2018. As required by the rule, testing for the other compounds is done over four consectutive quarters. Fort Worth’s testing period is from June 2018 through March 2020. The results shown are for the final quarter of sampling, which occurred from January 2020 to February 2020. Additional Information: www.epa.gov/dwucmr
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Maintaining Southlake’s Water Storage Tanks The City of Southlake is responsible for maintaining seven water storage tanks that work to distribute water throughout our community. Of these tanks, 4 are elevated storage tanks (commonly known as “water towers”) and 3 are ground storage tanks. All together, they hold a total of 21 million gallons! Each one plays a vital role in not only ensuring that water reaches Southlake’s homes and businesses, but that the water provided meets regulatory and safety standards. Per the Texas Commission on Environmental Quality, the City is required to inspect our water tanks annually. These inspections require the evaluation of several items, both inside and outside the tank. The external inspection looks for areas where potential issues in structural integrity could arise by evaluating the conditions of the foundation, protective coating, access points, and vents. The internal inspection evaluates the water quality, protective coating, and access points throughout the tank interior. In addition to the required inspections, the City of Southlake Public Works Department also conducts annual cleanings. Typically, the tank will be taken out of service and drained so that the interior can be power washed and disinfected before being refilled. After it has been refilled, a sample of the water is taken to verify that it meets safety and quality standards following the cleaning process. Once the results are received from the lab and the water is deemed safe, the tank is put back into the service cycle. Overall,
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the entire process of inspecting and cleaning a tank takes about three to five days, depending on the size of the tank, and is done during the winter months when water consumption is at its lowest. Information collected from condition assessments are then compared to previous years so that any preventative measures can be taken to keep the tanks, and the water they hold, in superior condition. Throughout the remainder of the year, the water in the tanks is kept safe through the persistent monitoring of various quality assurance mechanisms. Each tank, for instance, is equipped with a mixing system. This system works to keep the water constantly moving so that water quality stays uniform. The water in the tanks additionally contains a chlorine residual that makes the water uninhabitable for harmful bacteria while not impacting the safety or quality of the water for human consumption. Cathodic protection is also utilized as a means of eliminating corrosion of the tank and any contamination of the water that is held inside. Technicians from the Public Works Department regularly visit all seven of our tanks to evaluate the conditions and make any necessary adjustments to these mechanisms, as well as any other areas of the tank that need attention. These frequent check-ups of the water storage tanks, combined with the thorough cleanings and inspections conducted each year, are crucial in fulfilling Southlake’s obligation to provide water that is safe, healthy, and of high quality for all who use it. CITY OF SOUTHLAKE | WATER QUALITY REPORT 2021
Water Conservation As the summer heat hits Southlake, remember to follow your watering schedule! Residents, businesses, and Homeowner Associations must only water on their designated days and between the hours of 6:00pm and 10:00am. Not sure how much to water based on recent weather? Sign up for weekly watering advice tailored to your location. This alert tells you how much you should be watering due to rainfall and temperature. Visit www.waterisawesome.com/ weekly-watering-advice/ for more information!
Save up to
$200 on your water bill!
Does your sprinkler system need a change? Most sprinkler systems are in need of some special attention to make sure they are working the way they are supposed to. Did you know that one broken sprinkler head on your property could waste 25,000 gallons in just six months?! Your free W.I.S.E. Guys evaluation will provide great recommendations on the condition of your sprinkler system. Don’t wait until a high summer water bill to get it fixed! Check out www.cityofsouthlake.com/wiseguys to learn how to sign up! WATER QUALITY REPORT 2021 | CITY OF SOUTHLAKE
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Be the Solution to Stormwater Pollution Stormwater is water that originates from rain or snowmelt. As stormwater runoff travels over land, it picks up chemicals, wastes, and trash that do not naturally occur in waterways. These pollutants not only impact the water quality of streams, ponds, and lakes, but also the wildlife that rely on these habitats. Residents and businesses in Southlake can help improve stormwater quality by being a part of the solution to solve pollution.
Drain Your Pool Chlorine and other chemicals in your pool can have harmful effects on the environment if your pool is not drained properly. Before you drain your pool, dechlorinate naturally or chemically. Once your pool water is dechlorinated to less than 0.1 ppm and the pH is between 6 and 8, drain your water through your lawn. If you need to discharge pool water to the sanitary sewer, contact Southlake Public Works at 817-748-8082 before draining.
Dispose Hazardous Waste Paint, medicine, pesticides, cooking oil, and cleaning supplies should not be flushed, placed down a drain, or thrown into the trash. These items can create blockages in plumbing or pose hazards to reservoirs, creeks, and streams. The City of Southlake partners with the Fort Worth Environmental Collections Center to help you dispose of household hazardous waste. Call 817-392-1234 to learn more about how you can take advantage of this program.
Adopt-A-Street The City of Southlake is looking for volunteers to help with litter cleanups around town to Keep Southlake Beautiful. Removing trash from roadways recudes the amount of litter enering our waterways. If you have neighborhood pride or have a soft spot for a certain street in town, consider participating in the “Adopt-a-Street” program. Gather your family, friends, or organization members to clean up your spot four times a year and be recognized with your own street sign! Visit www.ExperienceSouthlakeTexas.com to learn more about this program.
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CITY OF SOUTHLAKE | WATER QUALITY REPORT 2021
ARE YOU IN THE KNOW? In 2016, the City of Southlake Public Works Department updated every water meter in Southlake with cellular technology that allows you to view your daily water use right on your phone, tablet, or computer. You can even set leak alerts so you can address any problems immediately and not be surprised by a large bill at the end of the month.
Sign up for your EyeOnWater account! https://southlaketx.eyeonwater.com
Let’s Talk About It The information in this report represents a high-level review of our City’s water. For additional information please contact the City of Southlake Public Works Department at 817-748-8082.
To participate in decisions concerning water, you may attend City of Southlake Council meetings. Please call 817-748-8183 or visit www.cityofsouthlake.com for more information regarding meeting times and dates.
Additional copies of the Water Quality Report are available in the Public Works Department offices at Town Hall, located at 1400 Main Street or at Public Works Operations, located at 1950 E. Continental Blvd.
If you have any questions concerning the CCR, please call the Drinking Water Quality Team at 512-239-4691 or email PWSCCR@tceq.texas.gov. When you contact the TCEQ please make sure that you reference the City of Southlake, ID #2200075.
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Este informe incluye información importante sobre la agua potable en la cuidad. Si tiene preguntas o comentarios sobre éste informe en español, por favor llama al tel. 817-748-8082 para hablar con una persona bilingüe en español.
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817-748-8051
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