Massachusetts regulates stormwater discharges under the Wetlands Protection Act (MGL c.131 §40) and 310 CMR 10.00, applying uniform Stormwater Management Standards to projects affecting wetlands and waterways.
Under MGL c.131 §40 and 310 CMR 10.00, any work within 100 feet of a wetland or 200 feet of a perennial stream requires a Notice of Intent and must meet the Massachusetts Stormwater Management Standards. The standards address peak runoff, recharge, water quality, and Total Maximum Daily Load (TMDL) compliance. Local conservation commissions administer the law but cannot weaken state minimums; they may impose stricter local bylaws under home rule.
Violations under MGL c.131 §40 carry fines up to $25,000 per day, restoration orders, and possible criminal penalties for willful violations.
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