MassDEP, Division of Watershed Management, Watershed Planning Program

http://www.mass.gov/eea/agencies/massdep/water/watersheds/2012-integrated-list-of-waters.html

Metals

Turbidity

Unknown CausePercent of Waters

Listed

Prioritize TMDL

Development

0.0 5.0 10.0 15.0 20.0 25.0

Pathogens

Nutrients

Noxious Aquatic Plants

Organic Enrichment, Low DO

60%

Development

1.Nutrients

2.Bacteria

� A “pollution budget” designed to restore the

health of a waterbody

� Includes relative contributions from all pollutant

sources (e.g., point and nonpoint)sources (e.g., point and nonpoint)

� Defines reductions necessary to meet Water

Quality Standards and designated uses

http://www.mass.gov/eea/agencies/massdep/water/watersheds/massachusetts-nutrient-management-report-2013.html

� Where:

� TMDL = Loading Capacity of Receiving Water

� WLAs = Portions Allotted to Point sources

LA’s = Portion allotted to Nonpoint sources� LA’s = Portion allotted to Nonpoint sources

� MOS = Margin of Safety (account for uncertainty)

� Consideration also given for background,

seasonal variability and future growth

Stormwater

WWTPs (66% reduction)

• Majors/Minors–� 0.1 mg/L TP summer

� 0.3 mg/L TP winter

Stormwater (51% reduction)

� Open/agriculture (35%)

� Low density residential (45%)

� Medium density residential (65%)

� High density residential (65%)High density residential (65%)

� Commercial/industrial 65%)

� Transportation (65%)

Margin of Safety – 6 %

Kimberly Groff, Ph.D.Director Watershed Planning Program

Massachusetts Department of Massachusetts Department of Environmental Protection627 Main Street, 2nd FloorWorcester, MA 01608

kimberly.groff@state.ma.us