The US Environmental Protection Agency (EPA) regulates the discharge of stormwater pollution as part of the Clean Water Act

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Programs in place

These programs regulate the stormwater discharges of Bernalillo County as part of Phase II regulations issued in 1999. These regulations require that small Municipal Separate Storm Sewer Systems (MS4s) apply for permits.

New Mexico is one of four states that do not have authorization to issue permits under the Clean Water Act, including also Idaho, Massachusetts and New Hampshire. This means that the Federal agency, EPA, issues permits directly to local governments (cities and counties) and to New Mexico businesses and construction sites.

While new stormwater regulations have not yet been formally proposed or codified, EPA has incorporated many new features into the Watershed General Permit for the Middle Rio Grande. This Watershed General Permit was proposed on Feb. 12, 2013.

MS4 General Permit

You can read Bernalillo County comments on the proposed permit, submitted to USEPA on June 30, 2013 by clicking here.

As part of the Clean Water Act and NPDES regulations, businesses performing industrial activities may need to acquire coverage under the Multi-Sector General Permit. Additional information may be found here:

Industrial Activities and Stormwater

Multi-Sector General Permit

Contractors performing construction activities involving one or more acres may also be required to gain coverage under the Construction General Permit to be in compliance with Clean Water Act and NPDES regulations. Additional information may be found here:

Construction Activities and Stormwater


New Mexico FlagBernalillo County's Stormwater Program

Under these regulations, Bernalillo County is required to obtain permits to allow discharges to the Rio Grande. In anticipation of permit issuance, Bernalillo County first created a Stormwater Quality Management Plan, and submitted this plan to EPA in March of 2003.

Once the general permit was published in 2007, Bernalillo County Public Works Division revised the original plan and submitted a revised Stormwater Management Plan (SWMP) with a formal permit application on April 1, 2007. 

The first general permit for small MS4s in New Mexico was issued by EPA and became effective on July 1, 2007.

Bernalillo County's 2007 permit application and SWMP were approved without modification on May 11, 2011. 

New Watershed General Permit NOI

A Notice of Intent is a formal declaration or legal document stating that an agency or company is filing an application to discharge water to a regulated stream. In this case Bernalillo County has filed a notice of intent (NOI) to discharge storm water into the Rio Grande. The eNOI form and attachments were delivered to USEPA, Region 6 (Dallas) on June 15, 2015.
After a comment period of 35 days, one comment was received from the Business Water Task Force. The comment and our reply are included as Attachment 2 below. 

This NOI does not reflect the entirety of the county stormwater program, merely our intention to comply with the new permit, and some general descriptions. Because of limitations of the form itself, the text is very abbreviated and cursory. The county is still in the process of developing new program elements, as are all other agencies working together on this permit.

FY 2020 MS4 Annual Report

Below is a link to the FY 2020 MS4 Annual Report for NPDES General Permit No. NMR04A000, as required by USEPA, Region 6.

Please send all comments to or call Kali Bronson at 224-2100.

Stormwater Quality Ordinance

The Bernalillo County Code, Chapter 38 (commonly referred to as the Drainage Ordinance or “Floods”) addresses storm drainage and storm runoff and provides standards for the design of storm water control facilities. However, the Drainage Ordinance does not address stormwater quality. The County’s NPDES Permit (or MS4 Permit) issued by EPA Region 6 on December 22, 2014 specifies that the County must perform certain actions, develop processes and procedures, and in some cases develop ordinances to ensure regulatory controls to provide stormwater quality protection and improvement. Specifically, stormwater quality control measures for Construction, Post Construction, and Illicit Discharge Detection and Elimination (or IDDE) require the development of an ordinance(s) or other regulatory mechanism(s) per the MS4 Permit.

The new stormwater quality ordinance for Bernalillo County can be found here: Bernalillo County Stormwater Quality Ordinances

Please send any questions or comments to or call Stormwater Program Compliance Manager Kali Bronson at (505) 224-2100. 


Tijeras Creek Watershed

This interactive map shows the land management, cultural landmarks, recreation infrastructure, habitat, land cover, soils, geology, hydrology and forest conditions of the Tijeras Creek Watershed, as well as the location and status of various plans and projects taking place within the watershed.
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