Westborough Tap Water Quality Report
Westborough's water has 2 contaminants above EPA MCLGs and 2 above EPA's legal limit (MCL, enforceable from April 26, 2029). We recommend using a certified water filter.
Other systems listed for Westborough with results above guidelines: CADY BROOK CROSSING CONDOMINIUMS (1 above guidelines)
Water system
WESTBOROUGH WATER DEPARTMENT
3 other systems are listed for Westborough. See their figures
People Served
21,567
Health-based violations since 2020
1
WESTBOROUGH WATER DEPARTMENT. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Feb 2024 · WESTBOROUGH WATER DEPARTMENT
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is Westborough Tap Water Safe to Drink?
We strongly recommend using a certified water filter to reduce exposure: Westborough's water has 4 contaminants above EPA health-based guidelines. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Westborough's water.
WESTBOROUGH WATER DEPARTMENT, Westborough's water system, serves 21,567 people. 3 other systems are listed for Westborough. Each system's results are listed under its own name, never added to WESTBOROUGH WATER DEPARTMENT's. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for WESTBOROUGH WATER DEPARTMENT is from Feb 2024.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in Massachusetts
Westborough Water Service Areas
What these numbers actually mean for Westborough, MA
We read Westborough, MA’s published record and send you a short report — which findings warrant a decision, which to ignore, and what to do about it. Including when the answer is nothing.
- 2 contaminants above EPA MCLGs and 2 above EPA's legal limit (MCL, enforceable from April 26, 2029), 6 contaminants with an EPA health goal detected in some samples (no level on file) and 1 health-based EPA violation that began after the latest compliance result on file
- 168 results on file
- 23 PFAS compounds on record
Buying a home here? Property Water Report — $49 Emailed within one business day.
Fluoride in Westborough's water
WESTBOROUGH WATER DEPARTMENT
PWSID MA2328000
WESTBOROUGH WATER DEPARTMENT reported 0.66 mg/L, below the 0.7 mg/L U.S. Public Health Service recommendation.
REGENCY AT BOLTON CONDOMINIUMS
PWSID MA2034030
REGENCY AT BOLTON CONDOMINIUMS reported 0.65 mg/L, below the 0.7 mg/L U.S. Public Health Service recommendation.
LANCASTER WOODS CONDOMINIUMS
PWSID MA2147008
No fluoride level in our data for LANCASTER WOODS CONDOMINIUMS. Your utility's annual water quality report (CCR) lists it.
CADY BROOK CROSSING CONDOMINIUMS
PWSID MA2054050
CADY BROOK CROSSING CONDOMINIUMS reported 1.36 mg/L, at or above the 0.7 mg/L U.S. Public Health Service recommendation and below the 1.5 mg/L WHO guideline value and NTP neurodevelopment review level.
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Recommended Water Filters for Westborough
Based on Westborough's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA's health goals (MCLGs) or legal limits (MCL).
Culligan
ZeroWater
NSF Certified:
Flow Rate
1.9 gpm
Daily Production
1 gpd
Highlights:
- Compact design
- Easy to set up
- Affordable
- NSF-42, NSF-53, NSF-401 certified
Removes 19 contaminants:
+14 more
Strontium, Molybdenum, Fluoride, Uranium, Lead, Total PFAS, Chlorine, 25, Phosphorus, Bicarbonate, Calcium, Carbonate, Magnesium, Sodium
Santevia
Bath Filter
NSF Certified:
Flow Rate
0.36 gpm
Highlights:
- Organic cotton design reduces plastic used in construction
- Affordable upfront & ongoing cost
- The only bath filter that removed 100% chlorine with “normal” faster faucet flow
Removes 1 contaminants:
Waterdrop
A1
NSF Certified:
Flow Rate
1 gpm
Highlights:
- Performance certified
- Lower price than Philips
- Hot water dispensing
- Compact design
Removes 5 contaminants:
Whirlpool Corporation
W11256135
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.7 gpm
Removes 19 contaminants:
+14 more
Benzene, Carbofuran, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chlorobenzene, Cryptosporidium, Ethylbenzene, Lead, Mercury, Metolachlor, Tetrachloroethylene, Toxaphene, Turbidity
Verify Your Water Quality with Independent Testing
With 2 contaminants above EPA MCLGs and 2 above EPA's legal limit (MCL, enforceable from April 26, 2029), 6 contaminants with an EPA health goal detected in some samples (no level on file) and 1 health-based EPA violation that began after the latest compliance result on file, independent laboratory testing provides a second opinion and can track changes over time.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
PFAS Forever Chemicals Test
$339.95
Specialized test for PFOA, PFOS, and 24 other forever chemicals. Essential for areas near military bases, airports, or industrial sites.
Tap Score
Haloacetic Acids (HAA9) Test
$275
Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.
With 4 contaminants above health guidelines, you may want to explore water purification options. Learn how to make distilled water at home for applications like humidifiers, CPAP machines, and baby formula.
What Westborough's water readings can explain
Utility-reported data for Westborough includes turbidity, sulfate and a chlorine-based disinfectant — the readings behind these common tap water questions. We publish a city-level hardness figure for Westborough, resolved from its water systems where they report one and estimated from county sampling where they do not. Each page starts with the hot-tap and cold-tap check, then shows what your own water system reported.
On a private well near Westborough? Public-water results do not apply to private wells. See Worcester County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in Westborough
Westborough's tap water measures 3.7 grains per gallon (63.8 mg/L) — moderately hard on the USGS scale, below the range where scale is usually worth treating.
Water softener cost for 3.7 gpg water in Westborough — equipment and local installation labour for your ZIP code, with the sizing arithmetic shown in full. For the national picture first, read what a water softener costs — equipment, installation labour and ten-year ownership, each separated out. For Massachusetts as a whole, read water softener cost in Massachusetts — priced against the plumber wage published for the state.
Frequently Asked Questions About Westborough Tap Water
Westborough's water has 2 contaminants above EPA MCLGs and 2 above EPA's legal limit (MCL, enforceable from April 26, 2029). We strongly recommend using a certified water filter to reduce exposure to these contaminants. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Westborough's water. EPA records a health-based violation for WESTBOROUGH WATER DEPARTMENT that began after its latest compliance result on file (Jun 2022): Treatment Technique (SWTR and GWR) (Surface Water Treatment Rule), which began on November 1, 2025. Every such result predates it; its later EPA UCMR 5 results (Feb 2024) screen for unregulated contaminants and cannot show the water met this standard, so this page does not call the water safe.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach WESTBOROUGH WATER DEPARTMENT. For a problem with your water now (discolored water, no water, low pressure, a leak), contact WESTBOROUGH WATER DEPARTMENT directly.
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