Stormwater Management

Stormwater quality requirements are mandated by the Federal government in the Clean Water Act. It has been a community’s responsibility to fund the program. 

Stormwater quantity requirements are mandated by the Federal Emergency Management Agency.

To meet these requirements, the State issues general stormwater permits for municipalities and in turn, the municipalities issue ordinances to adhere to the State requirements. Below are some of the State permits and Town Ordinances required for Stormwater Management.

Special Announcement

The Town of Oro Valley will soon launch a new and improved way for Water Utility and Stormwater Utility customers to pay their bills online and manage accounts. To prepare for the change, the Water Utility Department will need to cut-off the current system on Friday, August 26th at 9 am. The new system will be available on Monday, August 29th. During the cut-off, online account access will not be available, and payments in any form will not be accepted.

To allow customers to get familiar with the new billing system, the Water Utility and the Stormwater Utility will not be imposing late fees or water shutoffs for the months of September and October of this year. If you have any questions, please contact the Stormwater Utility at 520-229-4850 option 3 or email

For payment options go to the blue tab below: Online Services - Pay your Stormwater Bill 

Contact Stormwater by Email:

Contact Stormwater by Phone: 520-229-4850 option 3.

Monsoon Preparedness       Guidelines to Drain Your Pool & Spa    Report a Spill          Sandbag Barriers    

Online Services - Pay your Stormwater Bill, Request Floodplain Status

Frequently Asked Questions

What is the Stormwater Utility and why do we need a Stormwater Utility Fee?

In 2002, the Arizona Department of Environmental Quality in response to Environmental Protection Agency mandates required all municipalities of less than 100,000 people to implement programs and practices to meet various storm water quality and quantity standards. Unfortunately the Federal Government did not provide any funding to meet these standards.  This fee will address these federally directed requirements.

What does the fee provide?

The fee will provide both visible and invisible benefits to Town of Oro Valley residents. The visible benefits will include additional street sweeping, vegetation control, culvert maintenance and minor repairs and maintenance after storms.

The less visible benefits include inspections for storm water control devices to ensure their proper operation, development of required storm water regulations and manuals, and studies and designs supporting mandated storm water activities.

What can our residents do to help improve stormwater quality?

On a routine basis, think about your actions, whether it is at home or at work, and what impact they may have on the environment and stormwater quality.  It has been shown that urbanization increases the variety and amount of contaminants carried into streams and washes.  The contaminants include:

a.  Sediment,
b.  Oil, grease, and toxic fluids from motor vehicles,
c.  Pesticides and nutrients from lawns and gardens,
d.  Viruses, bacteria, and nutrients from pet wastes and failing septic systems,
e. Trace metals and toxic organic compounds from roof shingles, motor vehicles, and improper handling and disposal of paints and household cleaning compounds, and
f.  Toxicological and physical affects of debris and waste material generated both residentially and commercially.   You can help to lessen the likelihood of contaminants entering stormwater runoff simply by thinking about and conducting your day-to-day activities in an environmentally friendly manner. 

Education and Outreach

Monsoon Preparedness Guide(PDF, 200KB)

Spa and Pool Drainage Requirements(PDF, 2MB)

Information for Contractors & Developers(PDF, 195KB)

Automotive Maintenance & Car Care(PDF, 205KB)

The Illicit Discharge Detection & Elimination (IDDE) Program is intended to ensure the health, safety, and general welfare of citizens, and the environment by protecting and enhancing the stormwater quality discharged through watercourses within the Town of Oro Valley.

For examples of illicit discharges, view the educational YouTube video below on "Illicit Discharge Detection & Elimination: A Grate Concern.

Town of Oro Valley Stormwater Management Program

This is a copy of a Staff Report regarding the 2020/2021 Town's MS4 Compliance Schedule, second quarter report, that was made to the Stormwater Utility Commission on January 21, 2021.

The Town of Oro Valley's (Town) Stormwater Management Program and Annual Report to ADEQ identify Minimum Control Measures (MCM’s) used to manage and control quality of stormwater runoff from the MS4. Each MCM has been given specific implementation dates and frequencies, measurable goals, and responsible departments.

This memorandum is a report on the Town’s Stormwater Management Program for the second quarter of the Annual Reporting Period for 2020-2021 (July 1st through June 30th). It has been prepared to keep stakeholders informed of the status of project implementation in terms of completed tasks that are either (A) ongoing or continuous, or (B) to be done a minimum of once each year.

Accompanying this Memorandum is a summary Table listing each of the six (6) required MCM’s along with their specific subset of Best Management Practices (BMP’s).

This summary Table shows that the Stormwater Utility is nearly up to date, and, with one possible exception, has met this quarter’s goals for implementing BMP’s that are ongoing and continuous.  The one deficiency is BMP 1.5 “Outreach Events at Town of Oro Valley Schools", and which understandably will not happen anytime in the foreseeable future.  

The Town manages stormwater quality in accordance with the Arizona Pollutant Discharge Elimination System (AZPDES) Permit AZG2021-002 that authorizes the discharge of stormwater from the municipal separate storm sewer system (MS4) to receiving waters, including Waters of the United States (WOTUS). The MS4 generally consists of roads, storm drains, and infrastructure carrying runoff into drainage ways or ephemeral stream channels. The Town has a Stormwater Management Program (SWMP) that describes the control measures it uses to manage the quality of discharges from the MS4. These Best Management Practices (BMPs) are:

MCM-1. Public Education and Outreach

MCM-2. Public Participation and Involvement

MCM-3. Illicit Discharge Detection and Elimination

MCM-4. Construction Site Runoff Control

MCM-5. Post-Construction Runoff Control

MCM-6. Pollution Prevention/Good Housekeeping for Municipal Operations

The Town’s Stormwater Management Program describes specific practices it uses to achieve compliance with Part 6.4 of the AZPDES Permit related to Minimum Control Measures, including specific implementation dates and frequencies, measurable goals, and responsible departments.

Stormwater Management Program
2021 Stormwater Management Program(PDF, 14MB)