CEDAR FALLS COMPREHENSIVE PLAN WASTEWATER TREATMENT PLANT


OVERVIEW The wastewater treatment plant is located at 501 East 4th


Street. It was built in 1939


and expanded in 1999. The capacity is 7,680,000 gallons per day and average flow is 5,100,000 gallons per day (2010). The facility uses a three stage trickling filter pro- cess and performs preliminary, primary, and secondary treatment and nitrification.


Permit: NPDES permit #0709001


EVALUATION • Good Condition; Consistently meets all permit requirements • Unable to meet newly established disinfection requirements • Facility long-term plan has been recently updated


RECOMMENDATIONS • Expand facilities to meet disinfection standards (currently under construction)


STORM WATER SYSTEM OVERVIEW


Figure 6.2 shows lines and inlets for the storm sewer system in Cedar Falls. Line sizes range from 6” to 84” depending on the need, and are located throughout the devel- oped area. Older residential areas of town are primarily served by traditional street- to-pipe systems with no storm water detention facilities. Industrial and commercial areas have small detention areas on site. New industrial and commercial detention has added a focus on water quality treatment. Many storm sewer lines flow into creeks or the Cedar River. There are few ditch conveyance systems left in developed areas. Cedar Falls does not have any combined sanitary/storm sewers, thereby avoid- ing problems with sewage backup.


Stormwater management improvements are typically constructed along with new residential, commercial or industrial development, or with new road construction. In- lets are repaired or replaced in conjunction with street reconstruction or resurfacing, though leaks are sealed as they occur. Inlets and structures are cleaned twice a year and streets are swept (to keep inlets free of debris) with the same frequency. New business and industry detention basins are maintained under a maintenance agree- ment with the property owner.


Cedar Falls has a stormwater utility fee to pay for improvements to the storm sew- er system. Although the stormwater system is managed by the city, the stormwater fee is managed by Cedar Falls Utilities (CFU). All properties are charged a monthly fee, while non-residential properties are assessed an additional fee according to their amount of impervious surface.


EVALUATION


• Functioning, but not effectively enough to prevent surface water impairments, erosion, and other degradation of surface waters


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