Rainwater Harvesting: Cambridge vs Lexington
How do rainwater harvesting rules compare between Cambridge, MA and Lexington, MA?
Cambridge and Lexington have similar restriction levels.
Cambridge, MA
Middlesex County
Rainwater harvesting is fully legal and encouraged in Cambridge. The Water Department runs rain barrel programs and the MS4 stormwater ordinance gives credits for qualifying larger installations.
View full Cambridge rules →Lexington, MA
Middlesex County
Rainwater harvesting is legal and encouraged in Middlesex County. Massachusetts has no statewide prohibition, and many towns offer rain barrel rebate programs through DPW and MWRA.
View full Lexington rules →Key Facts Comparison
| Fact | Cambridge | Lexington |
|---|---|---|
| Legal status | Fully permitted and encouraged | - |
| Small rain barrel permit | Not required | - |
| Indoor reuse | Plumbing permit and backflow required | - |
| Stormwater credits | Available for larger systems | - |
| Program contact | Cambridge Water Department | - |
| Legality | - | Fully legal statewide |
| Outdoor Use | - | No permit needed |
| Rebate Programs | - | MWRA and local DPWs |
| Cistern Permit | - | Over 1,000 gal typically |
| Potable Use | - | 248 CMR plumbing compliance |
Highlighted rows indicate differences between cities.
Cambridge FAQ
Do I need a permit for a 50 gallon rain barrel in Cambridge?
No. Simple residential rain barrels are exempt and even subsidized through city programs.
Can I connect harvested rainwater to my toilets?
Yes with a plumbing permit, backflow preventer, and 248 CMR 10.00 compliant dual plumbing.
Lexington FAQ
Are rain barrels legal in Middlesex County?
Yes, fully legal. Many Middlesex towns offer subsidized rain barrels through DPW or MWRA rebate programs.
Can I drink harvested rainwater?
Not without state plumbing code compliance (248 CMR). Harvested water is typically for outdoor irrigation only.
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