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Aquarion Water Company (Dover)

What EPA’s and Massachusetts’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.

Serves
1,929 people
Connections
647
Water source
Groundwater
Based in
Dover, MA
County
Norfolk
Owner
Private
Hardness
Varies by source
The ZIP code it serves

02030

The short answer

1 result is above the limit’s level with no violation recorded, and 1 more is above the health goal. The worst: Haloacetic acids (HAA5), above the limit’s level, no violation. 1 health-based violation since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2009 to 2025.

Haloacetic acids (HAA5), total trihalomethanes (TTHM), nitrate, fluoride, chromium (total) and arsenic: Massachusetts’s own results, samples taken from June 3, 2020 to Aug. 6, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the limit’s level, no violation recorded1

Haloacetic acids (HAA5)

Forms or is added in treatment

Above the limit’s level, no violation

80ppb

Highest yearly average, 2021 to 2026

2026 average: 6.5 ppb

Averaged by year, the highest was 80 ppb, in 2021, above EPA’s legal limit of 60 ppb. Its highest single sample was 110 ppb. In 2026, the latest year on file, its six samples averaged 6.5 ppb. EPA judges this limit on running averages at each sampling point, and recorded no violation for haloacetic acids (HAA5) at this utility since 2020. Results like these with no violation often include water sampled before treatment or blending; the utility’s annual report says what reaches the tap. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.55 ppb, in 2018.

What handles it

No certification claim covers this compound yet.

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

5.0ppb

90th percentile, 2025

In the latest period, 9 in 10 homes sampled were at or below 5.0 ppb, below EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027. EPA’s health goal for lead is zero.

What handles it

Below EPA’s limits4

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

56ppb

Highest yearly average, 2021 to 2026

2026 average: 12.9 ppb

Averaged by year, the highest was 56 ppb, in 2023, below EPA’s legal limit of 80 ppb. Its highest single sample was 110 ppb. In 2026, the latest year on file, its six samples averaged 12.9 ppb. EPA recorded no violation for total trihalomethanes (TTHM) at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 12.2 ppb, in 2017.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Nitrate

Comes from the source

Below EPA’s limits

5.3ppm

Highest sample; found in 31 of 31

2026 average: 3.5 ppm

The highest sample, in 2021, was 5.3 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its four samples averaged 3.5 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 4.4 ppm, in 2014.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.26ppm

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 0.26 ppm, in 2020, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.32 ppm. In 2026, the latest year on file, it wasn’t found in any of its three samples.

What handles it

Chromium (total)

Comes from the source

Below EPA’s limits

0.34ppb

Highest yearly average, 2020 to 2026

Averaged by year, the highest was 0.34 ppb, in 2026, below EPA’s legal limit of 100 ppb. Its highest single sample was 1.0 ppb. That was also the latest year on file.

What handles it

One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. How whole-house systems compare.

Filters with those claims on a certifier’s listing

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Compare five-year costs

The best water filters for lead, ranked

Hardness

Soft to moderately hard depending on the source, 27 to 97 mg/L (1.6 to 5.7 grains per gallon), across 4 sampling points, 2021 to 2025.

Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.

Softeners compared, salt includedSoftener or salt-free conditioner?Massachusetts water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Revised Total Coliform RuleE. coli was confirmed in the water system.EPA: Maximum Contaminant Level Violation, E. coli (RTCR)June 1, 2020 to June 30, 2020—Archived
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 4 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Haloacetic acids (HAA5), total trihalomethanes (TTHM), nitrate, fluoride, chromium (total) and arsenic results here are Massachusetts’s own from 2020 on, with EPA’s national file for 2012 to 2019. Aquarion Water Company (Dover)’s own annual report, which it must send you every year, has the contaminants this page does not show.

  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.

  • What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.

  • Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; Massachusetts’s results run from June 3, 2020 to Aug. 6, 2026.

Testing your own tap

Aquarion Water Company (Dover)’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab Massachusetts certifies.

The 3 labs Massachusetts certifies closest to the area Aquarion Water Company (Dover) serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • White Lodge Laboratory

    Westwood, MA · about 4 miles

    Certified for bacteria

    (781) 710-6498

  • Matrix Sciences International Inc.

    Canton, MA · about 9 miles

    Certified for bacteria

    (781) 401-9999

  • Mass DPH Environmental Chemistry Lab

    Jamaica Plain, MA · about 10 miles

    Certified for lead and copper, metals

    (617) 983-6654

All 81 certified labs for Massachusetts

Sources

PWSID MA3078006. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Norfolk County

All Massachusetts utilities

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