Total Maximum Daily Loads
For information pertaining to TMDLs in the North Coast Region, please contact Aly, TMDL Unit Senior, at 707-576-2650 or email@example.com.
What is a TMDL?
The Total Maximum Daily Load (TMDL) process leads to a "pollution budget" designed to restore the health of a polluted or impaired body of water. The TMDL process provides a quantitative assessment of water quality problems, contributing sources of pollution, and the pollutant load reductions or control actions needed to restore and protect the beneficial uses of an individual waterbody impaired from loading of a particular pollutant. More specifically, a TMDL is defined as the sum of the individual waste load allocations for point sources, load allocations for non-point sources, and natural background such that the capacity of the water body to assimilate pollutant loading (the loading capacity) is not exceeded (40 CFR §130.2).
In other words, a TMDL is a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards. This calculation also includes a margin of safety and consideration of seasonal variations. In addition, the TMDL contains the reductions needed to meet water quality standards and allocates those reductions among the pollutant sources in the watershed. See the Introduction to TMDLs fact sheet for more information.
Guidance Document for the Control of Excess Sediment Discharges
The Guidance Document is intended to provide examples of excess sediment discharge sites, sediment control practices, road management practices, and sediment assessment methods. It will also contain suggested content for a comprehensive inventory, prioritization, and sediment control plan. Monitoring guidance may also be included.
The Guidance Document is under development, although it is currently a low priority for staff completion. It will be presented to the Board upon completion.
For information, comments, and questions on the Guidance Document, please contact Katharine Carter at 707-576-2290 or firstname.lastname@example.org.
Sediment TMDL Implementation Monitoring Strategy
The Monitoring Strategy is intended to provide feedback on the recovery of sediment-impaired water bodies and the success of the Sediment TMDL Implementation Strategy and efforts to reduce excess sediment discharges. It will include monitoring objectives, the locations of trend monitoring stations, a description of the parameters to be monitored, benchmark conditions, measurable milestones, and specific due dates for monitoring and data analysis.
The Monitoring Strategy is under development. It will be presented to the Board upon completion, which is expected in 2017.
For information, comments, and questions on the Monitoring Strategy, please contact Rich Fadness at 707-576-6718 or email@example.com.
- The Integrated Report - 303(d) List of Water Quality Limited Segments and 305(b) Surface Water Quality Assessment
The Integrated Report - 303d List and 305b Report
California has integrated the 303(d) List of Impaired Waters and the 305(b) Water Quality Assessment Report into a single report (Integrated Report). This Integrated Report satisfies the requirements of both CWA Sections 303(d) and 305(b).
To visit the Integrated Report webpage, please click on the link below.
- TMDLs Start
- Sediment TMDL Implementation Policy
- The Integrated Report - 303(d) List of Impaired Waterbodies and The 305(b) Water Quality Assessment
- TMDL Development
- US EPA TMDLs
- Albion River
- Big River
- Eel River, North Fork
- Eel River, Upper Main
- Eel River, Middle Main
- Eel River, Middle Fork
- Eel River, Lower Main
- Eel River, South Fork
- Elk River
- Freshwater Creek
- Garcia River
- Gualala River
- Klamath River
- Laguna De Santa Rosa
- Lost River, Upper
- Lost River, Lower
- Mad River
- Mattole River
- Navarro River
- Noyo River
- Redwood Creek
- Russian River
- Salmon River
- Scott River
- Shasta River
- Stemple Creek
- Ten Mile River
- Trinity River
- Trinity River, South Fork
- Van Duzen River
(Page last updated 10/25/17)
Water is a precious resource in California, and maintaining its quality is of utmost importance to safeguard the health of the public and the environment.