Assess the entire construction project, discharge destination and disturbed area before deciding whether a sewer or water trench needs Arizona construction-stormwater coverage. The general permit includes covered projects disturbing at least one acre and smaller work within a qualifying larger common plan. A plumbing-only footprint or city right-of-way permit does not decide AZPDES coverage for the whole project.
How do acreage and the common plan matter?
ADEQ's Construction General Permit program includes qualifying construction activity disturbing one acre or more. It also includes activity below one acre that is part of a larger common plan of development or sale ultimately disturbing at least one acre. Dividing a project into small plumbing contracts does not necessarily remove that common-plan connection.
The permit addresses covered stormwater discharges to protected surface waters, including relevant storm-sewer conveyances. Assess where runoff can actually travel instead of assuming desert soil means no discharge. Tribal-land projects need the appropriate federal or other authority; the ADEQ permit is not authorized for those sites. ADEQ's current 2025 permit explains eligibility and coverage; a site's particular destination and permit conditions still need review.
What must be coordinated before work starts?
Identify the responsible operator or operators, existing coverage and the portion of the stormwater pollution prevention plan that governs the excavation. ADEQ directs applicants to complete the SWPPP before submitting the Notice of Intent through myDEQ. An application, a contractor's verbal assurance and a city's excavation approval are not interchangeable with actual coverage.
The project team should plan controls for exposed soil, spoil, construction entrances, materials and concrete or other waste. Assign inspection, corrective-action and record responsibilities so the trench crew knows whose plan applies. Keep changes in work limits or drainage conditions connected to that plan rather than treating the excavation as an isolated service call.
Is pumped trench water covered too?
Do not assume the construction permit authorizes every discharge generated at the job. Groundwater, pipe-test water and contaminated liquids can need a separate assessment of eligibility, water quality and destination. Use the dewatering and test-water workflow before choosing where to pump it.
Likewise, a street or right-of-way permit addresses another authority's requirements. Verify both where applicable. Keep the authorization, SWPPP, inspection records and stabilization or termination responsibilities in the project file. Finishing the pipe repair does not alone establish that every environmental coverage obligation has ended.