Is emergency power required for sewer collection system lift stations?
Yes in most cases. Maricopa County Environmental Health Code (MCEHC) Chapter I, Section 2, Regulation 5 states: "For systems that treat, or which are designed to treat greater than 10,000 gallons/day, a standby power source shall be provided at all sewage treatment systems and/or pump stations where a temporary power failure may allow a discharge of raw or partially treated sewage. Standby power may be via a standby generator, separate feeders from separate substations, a loop feeder on separate transformers from a common substation, or a high-level alarm with portable generators. Standby power also shall be provided to any sewage treatment systems and/or pump stations, regardless of size, if a temporary power failure may allow a discharge into surface waters classified as 'Unique Waters', by the Arizona Department of Environmental Quality."

This is also a requirement for obtaining a Type 4 General Aquifer Protection Permit for a sewer collection system as described in Arizona Administrative Code R18-9-E301.D.5f. For more information, please call 602-506-1058.

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1. Is emergency power required for sewer collection system lift stations?
2. What are the design requirements for venting wet wells, dry wells, basins, tanks and reservoirs?
3. What are the design requirements for wet well, basin, tank or reservoir overflows?