Newton, Massachusetts
Newton Water Quality
MWRA reservoir water through Newton's own 319 miles of main. The City says every known lead service line is gone. What its 2025 letter flags instead is galvanized iron lines and tuberculation in older pipes.
Known lead lines replaced · galvanized letters Nov 2025 · lead 1.72 ppb · 273 flushing sequences.
The short answer
Newton buys MWRA water from the Quabbin and Wachusett Reservoirs, disinfected with monochloramine. The City's letter in the 2025 report says it has replaced all known lead service lines, and 2025 lead results were 1.72 ppb at the 90th percentile, with 0 of 23 homes over the action level.
The open items are different. In November 2025 the City wrote to every property with a galvanized iron line that could contribute lead, or an unknown material. It also says older mains build up tuberculation that affects taste, odor and color, which is why it spends about $4.5 million a year on mains and ran 273 flushing sequences in 2025.
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Tell us your Newton address. We confirm coverage first, then schedule a licensed technician to test at your tap — no charge, no obligation.
What filtration does — and does not
Softening, carbon and reverse osmosis solve different problems. Newton's report points at chloramine and sediment, not hardness.
Where Newton water comes from
Protected reservoir water treated by MWRA, then delivered by the City.
Quabbin and Wachusett Reservoirs
Newton is an MWRA member community. Its water comes from the Quabbin and Wachusett Reservoirs, the same supply as Boston and most of the inner suburbs.
Carroll Water Treatment Plant
MWRA treats it in Marlborough with ozone and UV, adjusts pH and alkalinity to reduce lead corrosion, adds fluoride and disinfects with monochloramine (average 1.99 ppm in 2025).
Then 319 miles of Newton main
The City of Newton Department of Public Works, Utilities Division, owns the distribution system (PWS 3207000) and runs leak detection twice a year across 319 miles of main.
What the 2025 Newton report actually says
Results are from the MWRA 2025 Drinking Water Test Results and the City of Newton's local letter. They are system-level figures, not a reading at your tap.
All known lead service lines replaced
Newton completed its service-line inventory in 2024 and says it has replaced all known lead service lines. It keeps updating the inventory.
Galvanized lines are the open item
In November 2025 the City mailed letters to every property its records show with a galvanized iron line that could contribute lead, and to every property with an unknown material. DPW has a replacement contract for galvanized lines.
Tuberculation in older mains
The City's letter says Newton's older pipes build up sediment and encrusted material called tuberculation, which can affect taste, odor and color. Main cleaning, lining and flushing target it.
Lead 1.72 ppb at the 90th percentile
2025 tap samples ranged from not detected to 2.39 ppb, with 0 of 23 homes over the 15 ppb action level. Copper was 37.6 ppb at the 90th percentile (0 of 23 over 1,300).
Monochloramine, not free chlorine
MWRA disinfects with monochloramine, averaging 1.99 ppm in 2025 (range 0.02–3.7). It lasts longer in pipes than chlorine and is harder for basic pitcher filters to remove.
Low byproducts, low sodium, PFAS below standard
MWRA reported TTHMs at 16.1 ppb and HAA5 at 15.8 ppb against limits of 80 and 60, a highest sodium of 35.6 mg/L, and PFAS well below the Massachusetts PFAS6 standard of 20 ppt.
What Newton is doing about its pipes
From the City of Newton DPW letter for 2025.
About $4.5 million a year
Newton says it is spending roughly $4.5 million a year, for at least the next 10 years, on water infrastructure, based on a 2021 Capital Efficiency Plan.
New main in 2025
The 2025 construction season installed 5,107 feet of new 8-inch main and 685 feet of new 12-inch main, timed with road resurfacing.
273 flushing sequences
Unidirectional flushing scours sediment and tuberculation from mains. Public Works completed 273 sequences in 2025. Expect short-term discoloration after flushing nearby.
Leaks found and fixed
Crews repaired 183 water main and service-line leaks and 37 leaking hydrants and gate valves; semi-annual leak detection found 145 leaks that were repaired.
Newton next to Waltham, Watertown and Brookline
All four buy the same MWRA water, so the differences are in local pipes. Waltham reports no lead, galvanized or unknown lines but recorded a November 2025 coliform exceedance. Watertown still counts about 400 lead goosenecks, and Brookline has copper above the MWRA-wide figure. Newton's issue is galvanized lines and old mains. For the electric side of the same city, see Newton battery backup.
Where these figures come from
Everything on this page traces to MWRA and the City of Newton.
- MWRA — 2025 Drinking Water Test Results, Newton edition (PDF) — MWRA treatment and detected contaminants, plus the City of Newton letter: lead and copper, the service-line inventory, galvanized-line letters, main rehabilitation, flushing and leak repairs.
- City of Newton — Drinking Water Information — where the City points residents with galvanized or unknown service lines.
Matching treatment to the finding
Newton's report supports chloramine-rated carbon and sediment filtration, plus checking your service line. It does not support a default equipment sale.
Find out what your service line is
If you got a November 2025 letter about a galvanized or unknown line, start there. Newton DPW's Utilities Division handles it at 617-796-1640.
Catalytic carbon for chloramine taste
Monochloramine is the main thing most Newton homeowners taste. Catalytic carbon, sized for chloramine, handles it better than standard carbon.
Sediment filtration after flushing
Tuberculation and flushing can send rust-colored sediment to the tap. A whole-house sediment stage protects fixtures and appliances.
Test at the tap first
The City's figures are system-wide. A test at your kitchen tap shows whether your plumbing, not the main, is the issue.
How the free test works
A licensed technician tests at your kitchen tap, walks the plumbing, and tells you which of the findings above applies to your house and which does not. There is no charge and no obligation.
Seamless Home is the licensed contractor of record on the work that follows. Installation is performed by vetted installing partners engaged as our subcontractors, and the workmanship obligation stays with us. Coverage is confirmed per service area rather than promised as blanket availability.
What a water treatment job with us covers
Installation and replacement of whole-home and point-of-use treatment, specified against what your water actually contains.
Sediment filtration
Installation of the first stage that protects everything downstream of it, sized to the service line and the household draw.
Softening
Installation of ion-exchange softening where hardness is the problem, including the drain connection the plumbing code treats as indirect waste.
Carbon filtration
Installation of carbon stages for taste, odour and disinfection by-products, specified from your utility's own water quality report.
Reverse osmosis
Point-of-use installation at the kitchen sink where the target is dissolved solids rather than whole-home flow.
Disinfection
Installation of UV or equivalent treatment where the supply is a private well or is otherwise not continuously disinfected.
System replacement
Replacing equipment that has reached the end of its service life, including the discharge and air gap details an inspector looks at.
This is installation and replacement work, specified from a published water quality report or a test of your supply — not from a sales chart. Coverage is confirmed per service area rather than promised as blanket availability.
What the work actually looks like
Treatment equipment is plumbing. Most of the job is the connection, the drain and the code detail behind it.
Newton water, answered plainly
Where does Newton's water come from?+
Newton buys its water from the MWRA, which draws from the Quabbin and Wachusett Reservoirs and treats it at the John J. Carroll Water Treatment Plant in Marlborough. The City of Newton's Department of Public Works distributes it.
Does Newton have lead service lines?+
Newton's letter in the MWRA 2025 report says the City has replaced all known lead service lines. It mailed letters in November 2025 to properties with galvanized iron lines that could contribute lead and to properties where the line material is unknown.
Why does Newton tap water sometimes look discolored?+
The City says older pipes develop tuberculation, a layer of sediment and encrusted material that can affect taste, odor and color. Flushing and main rehabilitation remove it, and flushing can stir up discoloration for a short time.
What were Newton's 2025 lead and copper results?+
The lead 90th percentile was 1.72 ppb (not detected to 2.39) and copper was 37.6 ppb (7.76 to 98.3). None of the 23 homes sampled were over either action level.
Is there PFAS in Newton's water?+
MWRA reports PFAS well below the Massachusetts PFAS6 standard of 20 parts per trillion, and says its sources have shown only trace amounts.
Where do these figures come from?+
From the MWRA 2025 Drinking Water Test Results with the City of Newton's local letter (PWS 3207000). Third-party aggregators are not used.
Related resources
Home water purification and treatment
The national service page behind this one.
Learn more →Waltham water quality
MWRA city with no lead, galvanized or unknown lines reported.
Learn more →Watertown water quality
MWRA town that still counts about 400 lead goosenecks.
Learn more →Boston water quality
The same MWRA supply through Boston Water and Sewer Commission mains.
Learn more →Newton battery backup
Eversource under the Newton Power Choice price.
Learn more →All home services
Water, battery, HVAC and solar under one licensed contractor of record.
Learn more →Get a free test at your tap
A licensed technician tests at your kitchen tap and tells you which findings apply to your house — chloramine taste, sediment from older mains, or plumbing metals. No charge, no obligation, and coverage confirmed at your address first.
Get a free test