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Adaman Mutual Water Company

What EPA’s and CDC’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
700 people
Connections
370
Water source
Groundwater
Based in
Adaman, AZ
County
Maricopa
Owner
Private
The ZIP code it serves

85340

The short answer

2 results are above EPA’s legal limit. The worst: Arsenic, above the legal limit. 4 health-based violations since 2016.

What handles it

What was found

Arsenic, nitrate, total trihalomethanes (TTHM) and haloacetic acids (HAA5): Arizona’s yearly averages per water system, as CDC’s Environmental Public Health Tracking Network publishes them, 2020 to 2023, with EPA’s 2012 to 2019 file for earlier years.

Chromium (total) and fluoride: EPA’s compliance monitoring file, samples taken from Jan. 25, 2012 to Jan. 16, 2018. Newer results are in the utility’s annual water quality report.

Above the legal limit2

Arsenic

Comes from the source

Above the legal limit

9.6ppb

Highest yearly average, 2020 to 2023

2023 average: 7.5 ppb

Averaged by year, the highest was 9.6 ppb, in 2022: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2023, the latest year on file, it averaged 7.5 ppb. EPA judges this limit at each sampling point, and recorded a violation for arsenic at this utility in 2025. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 9.5 ppb, in 2018, and EPA recorded a violation in 2013.

What handles it

  • NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
  • NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”

Nitrate

Comes from the source

Above the legal limit

6.8ppm

Highest yearly average, 2020 to 2023

2023 average: 6.6 ppm

Averaged by year, the highest was 6.8 ppm, in 2020, below EPA’s legal limit of 10 ppm. In 2023, the latest year on file, it averaged 6.6 ppm. EPA judges this limit at each sampling point, and recorded a violation for nitrate at this utility in 2025. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 9.4 ppm, in 2016.

What handles it

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

Below EPA’s limits4

Chromium (total)

Comes from the source

Below EPA’s limits

44ppb

Highest yearly average, 2012 to 2018

2018, one sample: 36 ppb

Averaged by year, the highest was 44 ppb, in 2012, below EPA’s legal limit of 100 ppb. In 2018, the latest year on file, its one sample was 36 ppb.

What handles it

Fluoride

Forms or is added in treatment

Below EPA’s limits

1.2ppm

Highest yearly average, 2012 to 2018

2018, one sample: 0.9 ppm

Averaged by year, the highest was 1.2 ppm, in 2012, below EPA’s legal limit of 4.0 ppm. In 2018, the latest year on file, its one sample was 0.9 ppm.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

23.5ppb

Highest yearly average, 2020 to 2023

Averaged by year, the highest was 23.5 ppb, in 2023, below EPA’s legal limit of 80 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 11.1 ppb, in 2016.

What handles it

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

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

5.5ppb

Highest yearly average, 2020 to 2023

Averaged by year, the highest was 5.5 ppb, in 2023, below EPA’s legal limit of 60 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.7 ppb, in 2013.

What handles it

No certification claim covers this compound yet.

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

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.”

  • NSF/ANSI 53

    Claims: Arsenic (Pentavalent)<=50 ppb Reduction, Nitrate/Nitrite (30 ppm challenge)

    For: Arsenic, Nitrate

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level)

  • NSF/ANSI 58

    Claims: Arsenic (Pentavalent)<=50 ppb Reduction, Nitrate/Nitrite Reduction

    For: Arsenic, Nitrate

    Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level); Nitrate

At the tap, or for the whole house?

These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. 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 reverse osmosis systems, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
ArsenicThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2025 to Dec. 31, 20250.011 MG/LResolved
ArsenicThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2025 to Sept. 30, 20250.011 MG/LResolved
NitrateThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2025 to Dec. 31, 202511 MG/LResolved
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryOct. 17, 2024—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 33 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Arsenic, nitrate, total trihalomethanes (TTHM) and haloacetic acids (HAA5) results here are Arizona’s yearly averages as CDC publishes them, from 2020 on, with EPA’s national file for 2012 to 2019. Chromium (total) and fluoride come from EPA’s file alone, which ends in 2019. Adaman Mutual Water Company’s own annual report, which it must send you every year, has newer results for those and 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; CDC’s yearly averages for Arizona cover 2020 to 2023; EPA’s compliance samples are from Jan. 25, 2012 to Jan. 16, 2018.

Testing your own tap

Adaman Mutual Water Company’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 Arizona certifies.

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

  • Legend Technical Services of Arizona, Inc. DBA Legend Analytical

    Phoenix, AZ · about 19 miles

    (602) 324-6100

  • Motzz Laboratory, Inc.

    Phoenix, AZ · about 19 miles

    (602) 454-2376

  • Alliance Technical Group, LLC – Phoenix

    Phoenix, AZ · about 19 miles

    (714) 832-0064

All 49 certified labs for Arizona

Sources

PWSID AZ0407001. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Maricopa County

All Arizona utilities

What to do next