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Cienega Water Company Inc

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
108 people
Connections
54
Water source
Groundwater
Based in
Parker, AZ
County
La Paz
Owner
Private
The ZIP code it serves

85344

The short answer

1 result is above EPA’s legal limit, and 1 more is above the health goal. The worst: Fluoride, above the legal limit. 6 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.

Fluoride: EPA’s violation records from 2020 on, with EPA’s 2012 to 2019 file for earlier years.

Chromium (total): EPA’s compliance monitoring file, samples taken from Feb. 12, 2013 to July 18, 2018. Newer results are in the utility’s annual water quality report.

Above the legal limit1

Fluoride

Forms or is added in treatment

Above the legal limit

4.6ppm

Limit violation, 2025

EPA recorded two violations of the legal limit for fluoride at this utility in 2024 and 2025. The highest measured level, for April 1, 2025 to June 30, 2025, was an average of 4.6 ppm, above EPA’s legal limit of 4.0 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.9 ppm, in 2012, and EPA recorded violations in 2012, 2013, 2015 and 2016.

What handles it

Above the health goal1

Arsenic

Comes from the source

Above the health goal

5.0ppb

Highest yearly average, 2021

Averaged by year, the highest was 5.0 ppb, in 2021: below EPA’s legal limit of 10 ppb, but above its health goal of zero. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 6.2 ppb, in 2018.

What handles it

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

Below EPA’s limits3

Nitrate

Comes from the source

Below EPA’s limits

1.2ppm

Highest yearly average, 2020 to 2023

2023 average: 0.88 ppm

Averaged by year, the highest was 1.2 ppm, in 2020, below EPA’s legal limit of 10 ppm. In 2023, the latest year on file, it averaged 0.88 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 1.4 ppm, in 2013.

What handles it

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

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

6.7ppb

Highest yearly average, 2020 to 2023

Averaged by year, the highest was 6.7 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 6.9 ppb, in 2012.

What handles it

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

Chromium (total)

Comes from the source

Below EPA’s limits

3.0ppb

Highest yearly average, 2013 to 2018

Averaged by year, the highest was 3.0 ppb, in 2018, below EPA’s legal limit of 100 ppb. That was also the latest year on file.

What handles it

2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Haloacetic acids (HAA5)
  • 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: Fluoride, Arsenic (Pentavalent)<=50 ppb Reduction

    For: Fluoride, Arsenic

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

  • NSF/ANSI 58

    Claims: Fluoride Reduction, Arsenic (Pentavalent)<=50 ppb Reduction

    For: Fluoride, Arsenic

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

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 water filters for fluoride, ranked

The best reverse osmosis systems, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
FluorideThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2025 to June 30, 20254.6 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
FluorideThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2024 to Dec. 31, 20244.4 MG/LResolved
FluorideThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2016 to Sept. 30, 20164.9 MG/LResolved
FluorideThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2016 to June 30, 20164.9 MG/LResolved
FluorideThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2016 to March 31, 20164.3 MG/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 104 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) comes from EPA’s file alone, which ends in 2019. Cienega Water Company Inc’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 Feb. 12, 2013 to July 18, 2018.

Testing your own tap

Cienega Water Company Inc’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 lab Arizona certifies closest to the area Cienega Water Company Inc serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Mohave Environmental Labs

    Bullhead City, AZ · about 74 miles

    (928) 754-8101

All 49 certified labs for Arizona

Sources

PWSID AZ0415002. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Nearby

All Arizona utilities

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