Avondale, AZ Environmental Rules: Erosion Control (2026)
Key Facts
- SWPPP trigger
- Construction disturbing 1+ acre of land
- Reviewing official
- NPDES coordinator, before permit issuance
- Reference manual
- Maricopa County Drainage Design Manual, Vol. III
- Ongoing duty
- Periodic inspection and logging of BMPs
Summary
Any Avondale construction project disturbing one acre or more of land must prepare and follow a stormwater pollution prevention plan (SWPPP) before a construction permit is issued, spelling out erosion and sediment control measures. The permittee must implement, inspect and log those measures throughout construction under the NPDES coordinator's review.
Any entity applying for a permit, authorization, license, or permission for construction activity that will disturb one (1) or more acres of land shall prepare a stormwater pollution prevention plan (SWPPP) for the management of stormwater discharges from the proposed construction site. The applicant shall refer to Volume III - Erosion Control of the Drainage Design Manual by the Flood Control District of Maricopa County, as amended, for guidance in developing the SWPPP.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 38 Update 1).
Full Breakdown
Sec. 8-64(a) requires any entity applying for a permit for construction activity disturbing one or more acres of land to prepare a SWPPP referencing Volume III, Erosion Control, of the Flood Control District of Maricopa County's Drainage Design Manual, including a site map showing runoff directions and disturbed areas, descriptions of structural and non-structural best management practices, a plan for final site stabilization including slopes and vegetation, and plans for managing stockpiled materials to prevent erosion and sediment transport. Sec. 8-64(b) requires the applicant to submit the SWPPP to the NPDES coordinator for review before a construction permit is issued, along with a copy of the Notice of Intent filed with the state permitting authority and a copy of the Maricopa County Rule 310 air permit application approval; a grading permit stays conditional on compliance with approved best management practices.
Sec. 8-65 then requires all land-disturbing activity to be completed in accordance with the approved SWPPP, obligating the permittee to implement every best management practice described in the plan and to periodically inspect them to confirm they are operating correctly and have not been damaged, maintaining an inspection log consistent with the state's construction general permit.
Violations & Fines
Violating the terms of an approved SWPPP, including its best management practices, is a civil violation under sec. 8-69(c)(3), carrying a civil penalty up to $2,500.00 per violation under sec. 8-70. Failing to properly control construction debris or sanitary waste under sec. 8-66, or releasing pollutants caused by inadequate erosion control, exposes the permittee to the same civil and criminal enforcement track as other stormwater violations, including class 2 misdemeanor charges under sec. 8-71 for knowing mishandling of significant materials.
Frequently Asked Questions
When does an Avondale construction project need a SWPPP?
What must an Avondale SWPPP include for erosion control?
What happens if a builder doesn't follow the approved SWPPP in Avondale?
Sources & Official References
Other rules in Avondale
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Erosion Control in Nearby Cities
How other cities in Maricopa County handle erosion control.