Hopkinton Tap Water Quality Report
Hopkinton's water has 1 contaminant above EPA MCLGs and 1 above EPA's legal limit (MCL, enforceable from April 26, 2029). Consider using a certified water filter for additional protection.
No single water system serves most of Hopkinton (19,971 residents, Census 2024 estimate). Its large systems are HOPKINTON WATER DEPARTMENT (EPA counts 10,341 people served, about 52% of Hopkinton's population); ASHLAND WATER AND SEWER DEPT. (EPA counts 18,832 people served, about 94% of Hopkinton's population). EPA's counts may include people served outside Hopkinton, so each share is at most that. Check which one bills you: each system's figures are shown separately below.
- HOPKINTON WATER DEPARTMENT: 171 contaminants tested, 1 above EPA MCLGs and 1 above EPA's legal limit (MCL); health-based violations since 2020: 0
- ASHLAND WATER AND SEWER DEPT.: 173 contaminants tested, 4 above EPA MCLGs; health-based violations since 2020: 0
2 other systems serving parts of Hopkinton report results above guidelines — check which system bills you. THE PRESERVE AT HOPKINTON CONDO (4 above guidelines), ESTATES AT HIGHLAND RIDGE (1 above guidelines)
Other systems listed for Hopkinton with results above guidelines: BROOK VILLAGE CONDOMINIUM (5 above guidelines), ASHLAND WATER AND SEWER DEPT. (4 above guidelines)
Water systems
2 large systems
Residents (Census 2024)
19,971
Health-based violations since 2020
0
HOPKINTON WATER DEPARTMENT. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Aug 2025 · HOPKINTON WATER DEPARTMENT
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is Hopkinton Tap Water Safe to Drink?
We recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems. Hopkinton's water has 1 contaminant above EPA health-based guidelines (MCLGs) and 1 above EPA's legal limit (MCL, enforceable from April 26, 2029).
HOPKINTON WATER DEPARTMENT, Hopkinton's water system, serves 10,341 people. 3 other systems also serve parts of Hopkinton. 2 other systems are listed for Hopkinton. Each system's results are listed under its own name, never added to HOPKINTON WATER DEPARTMENT's. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for HOPKINTON WATER DEPARTMENT is from Aug 2025.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in Massachusetts
Hopkinton Water Service Areas
What these numbers actually mean for Hopkinton, MA
We read Hopkinton, 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.
- 1 contaminant above EPA MCLGs and 1 above EPA's legal limit (MCL, enforceable from April 26, 2029) and 8 contaminants with an EPA health goal detected in some samples (no level on file)
- 167 results on file
- 23 PFAS compounds on record
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Fluoride in Hopkinton's water
The 5 largest of the 6 water systems serving Hopkinton, by population served.
ASHLAND WATER AND SEWER DEPT.
PWSID MA3014000
ASHLAND WATER AND SEWER DEPT. reported 0.11 mg/L, below the 0.7 mg/L U.S. Public Health Service recommendation.
HOPKINTON WATER DEPARTMENT
PWSID MA2139000
HOPKINTON WATER DEPARTMENT reported no detectable fluoride.
BROOK VILLAGE CONDOMINIUM
PWSID MA2037007
BROOK VILLAGE CONDOMINIUM reported no detectable fluoride.
ESTATES AT HIGHLAND RIDGE
PWSID MA2139010
ESTATES AT HIGHLAND RIDGE reported 0.45 mg/L, below the 0.7 mg/L U.S. Public Health Service recommendation.
THE PRESERVE AT HOPKINTON CONDO
PWSID MA2139008
No fluoride level in our data for THE PRESERVE AT HOPKINTON CONDO. Your utility's annual water quality report (CCR) lists it.
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Recommended Water Filters for Hopkinton
Based on Hopkinton'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
Test Your Water Quality
Professional laboratory testing provides accurate, detailed analysis of your drinking water.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
Haloacetic Acids (HAA9) Test
$275
Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.
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.
What Hopkinton's water readings can explain
Utility-reported data for Hopkinton includes manganese, turbidity and sulfate — the readings behind these common tap water questions. We publish a city-level hardness figure for Hopkinton, 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 Hopkinton? Public-water results do not apply to private wells. See Middlesex County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in Hopkinton
Hopkinton's tap water measures 2.8 grains per gallon (47.4 mg/L) — soft on the USGS scale, below the range where scale is usually worth treating.
Water softener cost for 2.8 gpg water in Hopkinton — 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 Hopkinton Tap Water
Hopkinton's water has 1 contaminant above EPA MCLGs and 1 above EPA's legal limit (MCL, enforceable from April 26, 2029). We recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach HOPKINTON WATER DEPARTMENT. For a problem with your water now (discolored water, no water, low pressure, a leak), contact HOPKINTON WATER DEPARTMENT directly.
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