Prescott Valley, AZ Environmental Rules: Stormwater Management (2026)

Section 12a-01-070 is the core rule in the Town of Prescott Valley, Arizona. All illicit connections and discharges to the municipal separate storm sewer system (the MS4) are prohibited, and the listed examples are expressly not the limit. The list covers discharges from commercial or mobile car washing and impervious surface pressure washing, concrete washing, oils, fuels, paints and greases, grit and sand from grinding, carpet cleaning, and chlorinated water from spas and pools. It also reaches discharges not disclosed on an application, plan, permit or certification, and continuing discharges from connections that were lawful when built.

Section 12a-01-080 lists allowable non-stormwater discharges, among them water line flushing, landscape irrigation, foundation and footing drains, air conditioning condensate, individual residential car washing, de-chlorinated pool and spa water, street wash water and emergency firefighting flows. The person discharging carries the burden of showing, through testing, records, plans and other documents, that the discharge is permitted.

The Town Engineer administers and enforces the chapter under § 12a-01-050. Plans for grading, building or other improvements must disclose any illicit or permitted non-stormwater discharge, with BMPs the Town Engineer approves, and owners must maintain those BMPs during and after construction (§ 12a-01-090). Site-specific stormwater pollution prevention plans are required for all construction projects one acre or greater, and smaller projects file a notice of intent. Separately, the grading appendix at § 7-02-350.J requires on-site detention of storm water for most developments other than single-family or multi-family of 2 units or less on individually platted lots.

Property owners and lessees must keep any watercourse on their land free of trash, debris and excessive vegetation (§ 12a-01-130). Anyone in control of a facility must notify the Town Engineer and ADEQ by telephone before noon of the next working day after a spill and follow with a written report within five working days (§ 12a-01-140).