Who's covered? |  What will have to be done? | 
Total Maximum Daily Load
(TMDL) Program

Who's Covered?

  • 303(d) listed waters - waters that do not meet water quality standards after applying existing required controls (minimum sewage treatment technology).

    Below are links to New England's 303(d) / 305 (b) listed waters sites:
  • Land use activities that discharge (from either point or non-point sources) specified pollutants (mostly nutrients, nuisance aquatic vegetation and pathogens, some metals).

What will have to be done?

Rules have not been finalized still proposed.0.
  • Comprehensive 303(d) list must be developed by states (MA has done this);

  • and total maximum daily pollutant loads (TMDL) must be determined for water bodies that are impaired or threatened by one or more pollutants or an unknown cause.
Below are links to New England's TMDL Information sites:
  • Priority must be assigned for each water requiring a TMDL to be done.

  • Proposed rules require "Reasonable Further Progress" to be made until TMDLs are established. These may effect:

    • Large new dischargers

    • Existing dischargers undergoing significant expansion

    • Dischargers in the state NPDES permit renewal process.

  • TMDLs must:

    • Quantify existing pollutant load

    • Delineation of the amount needed to attain water quality standards

    • Identify sources

    • Allocate pollutant loads from point and non-point sources

    • Allow for reasonable foreseeable growth

    • Have an implementation plan


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