The Cohasset Water Department provides public drinking water to about 7,000 Cohasset residents with about 2,600 connections, 38 miles of water mains, 750 valves, and 400 hydrants.
UPDATE - BEECHWOOD ST. WATER MAIN REPLACEMENT
Next week Monday, April 24th through Wednesday, April 26th the contractor, KJS, will be connecting the individual homes in the construction area to the above ground bypass. When the connection is being made it will be necessary to shut down the individual home for approximately 20 minutes.
Tuesday, April 25th – Water will be shut down to Ox Pasture Lane from 8:30 am – 11:30 am to tie in the water main to the above ground bypass.
We appreciate your patience and apologize for any inconvenience while we make these critical improvements to your water system.
Should you have any questions please contact the Water Department at (781) 383-0057.
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Our Water Supply
Cohasset's drinking and usable water comes from three water supplies, which are Lily Pond, Aaron River Reservoir, and Ellms Meadow. Lily Pond has a maximum capacity of 79 million gallons of water, which spans over a 52 acre area. Aaron River Reservoir has a maximum capacity of 479 million gallons of water over a 136 acre area. Aaron River is connected to Lily Pond and it is used as a supplement in times of high water demand.
The smallest of the 3 water sources is Ellms Meadow in downtown Cohasset with the pumping station on James Lane. The wellfield previously provided a seasonal supply of water. Since it was insulated in 2015, the wellfield is now pumping year round as water levels permit. During peak flow it provides about 30% of Cohasset's usable water. Since the reservoir was opened in the 1970s, Cohasset's water users have not been affected by seasonal droughts even though the surrounding towns have.
Through a state permit, the water department is selling water on a monthly billing basis, to the Linden Pond complex, which provides annual revenue of approximately $300,000. The water is supplied through an interconnection with the Hingham system that was totally paid for by Linden Ponds. No water is sold or given to Hingham.
- Manage, improve and control all aspects of the town water system.
- Award contracts for work to be performed in the maintenance and construction of Town water systems
- Establish rules and regulations for the use of the Town water systems
- Fix just and equitable rates for the use of Cohasset's water system
- Keeping necessary records
- Maintain daily flow rates and acceptable water quality
- Provide on-site inspections and evaluations
- Submit reports to the Massachusetts Department of Environmental Protection
Forms & Documents
- Final Report Cohasset
- Town of Cohasset-TTHM Removal Evaluation -07.16.2019
- Chlorine The Achilles Heel (PDF)
- Cohasset Water Department Taste and Odor Study (PDF)
- Disinfection Byproduct Compliance Evaluation (PDF)
- Drinking Water and Watershed Map (PDF)
- Protect Our Water Supply
- General Requirements for the Installation and Use of a Water Meter for Irrigation (PDF)
- Lead in Drinking Water (PDF)
- Lily Pond Limnology and Waters Edge Study (PDF)
- Low Impact Development Case Study (PDF)
- Rate Study 2015
- Rehabilitation of the Cohasset Water System (PDF)
- Source Water Assessment and Protection Report (PDF)
- Surface Water Supply Protection Plan for Lily Pond and Aaron River Reservoir (PDF)
- Town Water Supply (PDF)
- Watershed Protection in Developed and Undeveloped Areas (PDF)
- WaterSmart MS4 Sediment and Erosion Control trifold
- Spring Flushing Program 4.22-4.23
- Spring Flushing Program 4.26.21
- Spring Flushing Program 4-29 4-30
- Spring Flushing Program May 3, 2021
- Lily Pond WTP Capacity Analysis (PDF)
- Lily Pond WTP CIP Presentation
- Lily Pond WTP 20-Yr CIP Report-Final
- Cohasset Water Department Updated Rules and Regulations Revised May -2023.doc