Skip to main content

Nutrient TMDL Impacts on Water Recycling in Southern California: A Step Backwards?

The full text article is not available for purchase.

The publisher only permits individual articles to be downloaded by subscribers.

or click here to sign up for a free trial


In March 2003 the US EPA released its final nutrient TMDL for the Malibu Creek watershed, located in northwest Los Angeles County. The TMDL identified dry weather receiving water objectives of 1.0 mg/l total nitrogen (TN) and 0.01 mg/l total phosphorus (TP) as necessary to eliminate impairments due to excess algal growth in the watershed. To achieve these objectives, it identified permissible nutrient loads from various nutrient sources, including recycled water irrigation, which was allocated a zero permissible load. The rationale offered for this allocation was that existing recycled water permits issued to the water district already prohibit runoff from recycled water irrigation. The EPA interpreted this prohibition very broadly, to include both surface and subsurface runoff of both recycled water and recycled water borne nutrients. This interpretation of runoff prohibitions, which are ubiquitous in recycled water permits throughout southern California, raises numerous questions about the sustainability of existing recycling efforts and the advisability of new efforts in an era of forthcoming nutrient TMDLs.

Document Type: Research Article


Publication date: January 1, 2003

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Ingenta Connect is not responsible for the content or availability of external websites

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more