Water System Historical Data

Water Main Breaks

Water Main Replacement Crew Update

In 2022, the Water Main Replacement Crew and Restoration Crew completed the challenge of completing the Main Street water main replacement project. This included replacing 2,180 feet of 10” steel water main with 12” PVC water main. This effort also included 2 new fire hydrants, 16 new valves, 5 tie-ins, and 40 service lines transferred to the new water main.

The Restoration Crew, along with the WMR Crew, replaced 4,042 square yards of 10” concrete pavement for the Main Street project. Total installation numbers for the WMR Crew were 4,175 feet of water main replacement, 5 fire hydrants, 21 valves, and 70 services switched over to new water mains. The Restoration Crew restored 5,650 square yards of driveways, pavement, curbs, and sidewalks. They also restored approximately 1 acre of yards. The Restoration Crew completed work for all the divisions in the Water and Sewer Division.

Though total numbers for replacement and restoration are down for the year, it was a major accomplishment for these crews to complete the Main Street project on time and under original budget.

Water Main Replacement Crew –(from left to right) Scott Brennan, Charlie Conway, Todd Norman, and Lucas Sproull (not pictured: Randy Holloway)

Water Valve Inspection Program

The Water Valve Inspection Program operates and fixes valves of the Distribution System. The program goal is to inspect and operate at least half of the City’s valves each year. Valve operation is critical in being able to shut down a water main quickly and safely and/or re-establish water in the event of an outage or emergency. The number of valves increases each year with the growth of the city within the City’s water distribution area.

Total number of valves in 2022: 2239

2022 Goal: 1102 Inspections

Number of Valves Inspected: 1064

Number of Valves Repaired: 67

2023 Goal: 1152 Inspections

Performance Measurements

O’Fallon Wastewater

The City of O’Fallon, Missouri, Sewer System includes a vast collection system and a full-scale, state-of-the-art regional wastewater treatment plant with a capacity of 11.25 million gallons per day; complete with three full equalization basins, dewatering and handling facility, large capacity interceptor sewers ranging up to 48 inches in diameter and large-capacity wastewater pumping stations located at strategic points in the system. The collection system consists of 250 miles of interceptor and collector lines ranging in size from 6 inches to 48 inches. The wastewater treatment facility is currently undergoing renovation as part of a Missouri Department of Natural Resources schedule of compliance, expected completion in spring 2023. The upgraded facility will consist of a biological nutrient removal treatment scheme encompassing primary screening and grit removal, four primary clarifiers, four biological nutrient removal reactors, four final clarifiers, ultraviolet disinfection, an effluent pumping station with a high flow discharge pump station, and secondary outfall, and biosolids screw press processing with landfill disposal. These changes will allow the City of O’Fallon to meet current and future water quality criteria set by state and federal regulations. The Biosolids processing facility consists of two (2) rotary drum thickeners, two (2) volute presses, and one (1) belt filter press. The Sewer System currently serves 17,484 customers, both inside and outside the city.

O’Fallon’s wastewater collection and treatment continues to exceed all criteria prescribed by the State of Missouri and the Environmental Protection Agency. The Wastewater Staff continually looks for and explores new processes to achieve greater efficiencies within the system.

2022 Wastewater Statistics

• Wastewater Treated – 2,700.4 million gallons

• Average Daily Flow – 7.40 mgd

• Peak Flow – 15.10 mgd (7/27/2021)

• Average CBOD (Carbonaceous Biochemical Oxygen Demand) – 7.84 mg/L (cannot exceed 25 mg/L)

• Average TSS (Total Suspended Solids)– 12.72 mg/L (cannot exceed 30 mg/L)

• Routine Line Cleaning Performed – 58,505 feet

• CCTV Inspection Footage – 226,327 feet

• Service Requests – 750

• Total Number of Actual Blockages – 6

• Line Locates – 6,760

Wastewater Collection System

250 miles of interceptor and collector lines; ranging from 6 inches to 48 inches

17 pump stations

6,697 manholes

Performance Measurements

Manhole Inspection Program

The Manhole Inspection Program has a goal to evaluate the condition of 1/10th of the Collection System’s manholes a year. The program evaluates the structural condition and whether the structure allows inflow and infiltration of ground water into the structure. Through the program, the manholes that do have defects are repaired and lined. The number of manholes increase each year due to the amount of growth within the City’s collection system area.

Total Number of System Manholes: 6,697

2022 Goal: 646 Inspections

Number of manholes inspected: 260

Number of manholes repaired: 60

2022 Goal: 646 Inspections

After

Wastewater Treatment Plant

• Originally constructed in 1984

• Permitted capacity of 11.25 million gallons per day

• Discharge point is in the Cuivre River Slough, off the Mississippi River just NW of where Peruque Creek discharges into the Slough

Water Service Line Insurance Program

The City of O’Fallon offers a Water Service Line Insurance Program that provides assistance for the repair of the water service line that connects each residence to the public water mains. The Program covers all residents of the City of O’Fallon and is administered by O’Fallon Water and Sewer. The program is funded by residents through a $12.00 annual fee that is paid when you pay your real estate tax.