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Wilmington DPW - Water & Sewer Division
121 Glen Road
Wilmington, Massachusetts 01887
Office of the Director
115 Andover Street
Wilmington, MA 01887
Telephone (978) 658-4711
Fax (978) 694-2003
TTY (978) 694-1417
Public Water Supply
# 3342000
Wilmington Water Supply:
The Wilmington distribution system consists of over 138 miles of water mains, 1250 public fire hydrants and three water storage tanks and provides drinking water to 99 percent of all residents and businesses in the Town. The Town has four active wells that serve as the primary supply of water for the system: Brown’s Crossing, Barrow’s, Shawsheen Avenue, and Salem Street. After being treated at one of the two water treatment plants, water is pumped to three storage tanks and to the homes and businesses in Wilmington. In times of high demand, MWRA (Massachusetts Water Resources Authority) water is used to supplement the Town’s supply. In 2023, Town wells supplied approximately 87 percent of drinking water while the MWRA provided about 13 percent.
How Is My Water Treated?
The water is first aerated to improve taste and then treated to remove iron and manganese. Alum is added to allow particles to clump together and settle out, and then the water is filtered through granulated activated carbon (GAC) beds. The water is disinfected with chlorine, which is then converted to chloramine to keep the water safe within the distribution system, without increasing disinfection byproducts. More detailed information on our sources, treatment, and the characteristics of the water you receive is available at www.wilmingtonma.gov/water-sewer-division.
| Regulated Substances | Unit | MCL | MCLG | Average Detected | Range | Major Sources | Violation |
|---|---|---|---|---|---|---|---|
| Haloacetic Acids -5 | ppb | 60 | NA | 14.43 | ND - 69.1 | By-product of disinfection | No |
| Total Trihalomethanes | ppb | 80 | NA | 27.06 | 2.6-41 | By-product of disinfection | No |
| Nitrate (highest) | ppm | 10 | 10 | 0.77 | 0.33 - 0.77 | Runoff from fertilizer use; leaching from septic tanks, sewage; Erosion of natural deposits | No |
| Nitrite (highest) | ppm | 1 | 0.219 | ND - 0.219 | Runoff from fertilizer use; septic tanks; sewage; erosion of natural deposits | No | |
| Barium | ppm | 2 | 2 | 0.02 | 0.013 - 0.024 | Common mineral in nature. | No |
| Chromium | ppb | 100 | 100 | 34 | 3.0 - 38 | Erosion of natural deposits | No |
| Sodium | mg/L | NA | NA | 89 | 68-110 | Common mineral in nature, de-icing. | No |
| Chlorine | ppm | 4 | 0.10 | 1.97 | 0.07-3.24 | Disinfectant | No |
| Arsenic | ppb | 10 | NA | 0.5 | N D -1.8 | Natural deposits; Orchards; runoff from glass and electronics production wastes | No |
| Perchlorate (highest) | ppb | 2.0 | NA | 0.025 | 0.019 - 0.031 | Rocket propellants, fireworks, munitions, flares, blasting agents | No |
| Gross Alpha radiation Sargent and Butters Row | pCi/L | 15 | 2.8 | 0.85-3.26 | Natural decay of uranium in rocks, soil. | No | |
| PFAS6 | ppt | 20 | NA | Highest Quarterly Average-11.5 | ND-13 | Production of moisture and oil resistant coatings, fabrics and other materials. Use and disposal of products containing PFAS. Fire-fighting foams. |
No |
Lead and Copper Sampling:
To comply with the EPA Lead and Copper Rule, the Wilmington Water Division completed two rounds of sampling in 2023. Sample results show that Wilmington remains in compliance as the 90th percentile results, 2.2 ppb and 2.1 ppb for lead and 86 ppb and 110 ppb for copper, are below the EPA Action Levels of 15 ppb for lead and 1300 ppb for copper.
| 2023 | Range | MCLG | 90% Value | Action Level | Samples Over Action Level |
| Lead (ppb) | 0.00-8.9 | 0 pb | 2.2 and 2.1 | 15 ppb | 0 of 30 |
| Copper (ppb) | 2.5 -180 | 1300 | 86 and 110 | 1300 ppb | 0 of 30 |
Mandatory Outdoor Water Restrictions:
NO Outdoor Watering between the hours of 9:00 AM and 5:00 PM.
Sprinkler Systems: Both above ground or installed underground, can be used once per week, subject to the restrictions above. VIOLATION OF THESE WATER USE RESTRICTIONS WILL RESULT IN A MINIMUM $50.00 PER DAY FINE.
Water & Sewer Commission Meetings:
The Commission meets the 3rd Thursday of each month at 5:00 p.m. at the Town Hall, unless otherwise posted. Please call in advance if you want to discuss a specific issue, and we will include your topic on our agenda.
If you would like to see a copy of our Source Water Assessment & Protection Program (SWAP) Report, it is available at the Wilmington Water Division and online at
www.mass.gov/dep/water/drinking/3342000.pdf. For more detailed information, call us at (978) 658-4711 or go to http://www.wilmingtonma.gov/water-sewer-division.
Joseph Lobao, Department of Public Works Deputy Director