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<td>Chesapeake Bay Watershed (entities subject to Bay TMDL requirements)</td>
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*Reduction efficiency
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*% reduction from existing load
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*Qualifying lane miles -lb/acre reduction
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*Mass load reduction
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<td>TN, TP, TSS</td>
 
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<td>Florida</td>
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<td>Mass load reduction</td>
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<td>TN, TP</td>
 
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<td>EPA Region 1 (New Hampshire and Massachusetts MS4 permittees)</td>
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<td>Mass load reduction with efficiency factors</td>
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<td>TN (NH only), TP</td>
 
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<td>Massachusetts – stormwater requirements (not linked to MS4 permit)</td>
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<td>Reduction efficiency - %</td>
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<td>TSS</td>
 
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<td>Wisconsin</td>
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*Reduction efficiency
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*progress towards % reduction target
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*Reduction efficiency - %
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*TSS, with conversion to TP
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*TP
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<td>Washington Ecology – MS4 permittees with TMDL</td>
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<td>Mass load reduction, effective developed acres reduction</td>
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<td>TP, sediment</td>
 
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<td>County and City of San Diego and MS4 Co-permittees</td>
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<td>Performance-based compliance</td>
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<td>Cu, Zn, Pb, TKN, TP</td>
 
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<td>Orange County and MS4 Co-permittees</td>
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<td>Reduction efficiency - %</td>
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<td>Bacteria, sediment</td>
 
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<td>City of Santa Cruz, California</td>
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<td>Modeled load reduction</td>
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<td>Sediment</td>
 
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<td>Vermont (Under development)</td>
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*Interim – modeled load reduction
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*Permanent – under development
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<td>TP</td>
 
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<td>North Carolina (Under development)</td>
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<td>Mass load reduction</td>
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<td>TN, TP</td>
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Revision as of 20:11, 22 September 2020

Crediting methods summary
Link to this table

Location Crediting method Pollutants
Chesapeake Bay Watershed (entities subject to Bay TMDL requirements)
  • Reduction efficiency
  • % reduction from existing load
  • Qualifying lane miles -lb/acre reduction
  • Mass load reduction
TN, TP, TSS
Florida Mass load reduction TN, TP
EPA Region 1 (New Hampshire and Massachusetts MS4 permittees) Mass load reduction with efficiency factors TN (NH only), TP
Massachusetts – stormwater requirements (not linked to MS4 permit) Reduction efficiency - % TSS
Wisconsin
  • Reduction efficiency
  • progress towards % reduction target
  • Reduction efficiency - %
  • TSS, with conversion to TP
  • TP
Washington Ecology – MS4 permittees with TMDL Mass load reduction, effective developed acres reduction TP, sediment
County and City of San Diego and MS4 Co-permittees Performance-based compliance Cu, Zn, Pb, TKN, TP
Orange County and MS4 Co-permittees Reduction efficiency - % Bacteria, sediment
City of Santa Cruz, California Modeled load reduction Sediment
Vermont (Under development)
  • Interim – modeled load reduction
  • Permanent – under development
TP
North Carolina (Under development) Mass load reduction TN, TP