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Mexican Hat Ssd

What EPA’s and Utah’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
120 people
Connections
40
Water source
Groundwater
Based in
Blanding, UT
County
San Juan
Owner
Local government
Hardness
Very hard
The ZIP code it serves

84531

The short answer

2 results are above the health goal. The worst: Lead, above the health goal. 1 health-based violation since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2001 to 2026.

Copper: EPA’s file records a utility’s copper only when it exceeds the action level. The last here was 1.8 ppm, for the period ending Dec. 31, 2015. None since is on file, so it is not counted as a current finding.

Arsenic, nitrate, fluoride and chromium (total): Utah’s own results, samples taken from Oct. 1, 2020 to July 14, 2026, with EPA’s 2012 to 2019 file for earlier years.

Haloacetic acids (HAA5) and total trihalomethanes (TTHM): EPA’s compliance monitoring file, samples taken from Sept. 13, 2012 to Aug. 27, 2017. Newer results are in the utility’s annual water quality report.

Above the health goal2

Lead

Comes from pipes, often your own

Above the health goal

2.2ppb

90th percentile, 2026

In the latest period, 9 in 10 homes sampled were at or below 2.2 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

Arsenic

Comes from the source

Above the health goal

1.3ppb

Highest yearly average, 2021 to 2025

Averaged by year, the highest was 1.3 ppb, in 2025: below EPA’s legal limit of 10 ppb, but above its health goal of zero. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.2 ppb, in 2015.

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 limits4

Nitrate

Comes from the source

Below EPA’s limits

1.9ppm

Highest sample; found in 3 of 8

2026, one sample: 1.9 ppm

The highest sample, in 2026, was 1.9 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its one sample was 1.9 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.91 ppm, in 2017.

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

0.36ppm

Highest yearly average, 2021 to 2025

2025, one sample: 0.23 ppm

Averaged by year, the highest was 0.36 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.37 ppm. In 2025, the latest year on file, its one sample was 0.23 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.4 ppm, in 2015.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

5.1ppb

Highest yearly average, 2012 to 2017

2017: not found

Averaged by year, the highest was 5.1 ppb, in 2012, below EPA’s legal limit of 60 ppb. In 2017, the latest year on file, it wasn’t found in its one sample.

What handles it

No certification claim covers this compound yet.

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

3.3ppb

Highest yearly average, 2012 to 2017

2017: not found

Averaged by year, the highest was 3.3 ppb, in 2014, below EPA’s legal limit of 80 ppb. In 2017, the latest year on file, it wasn’t found in its one sample.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Chromium (total)

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: Lead Reduction, Arsenic (Pentavalent)<=50 ppb Reduction

    For: Lead, Arsenic

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

  • NSF/ANSI 58

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

    For: Lead, Arsenic

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

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

The best reverse osmosis systems, ranked

Hardness

Very hard, typically 345 mg/L (20.2 grains per gallon), across 2 sampling points, in 2021.

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 at 20.2 grains per gallon, salt includedSoftener or salt-free conditioner?Utah water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Revised Total Coliform RuleColiform results required a check of the system, and the check or its fixes were not done on time.EPA: Treatment Technique, Level 1 Assessment (RTCR)Nov. 25, 2017—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 57 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Arsenic, nitrate, fluoride and chromium (total) results here are Utah’s own from 2020 on, with EPA’s national file for 2012 to 2019. Haloacetic acids (HAA5) and total trihalomethanes (TTHM) come from EPA’s file alone, which ends in 2019. Mexican Hat Ssd’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; Utah’s results run from Oct. 1, 2020 to July 14, 2026; EPA’s compliance samples are from Sept. 13, 2012 to Aug. 27, 2017.

Testing your own tap

Mexican Hat Ssd’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 Utah certifies.

No lab Utah certifies is within 75 miles of the area Mexican Hat Ssd serves on the state’s list. Some take samples by mail; the state’s page lists them all.

All 60 certified labs for Utah

Sources

PWSID UTAH19008. Rebuilt from EPA data on Oct. 18, 2026.

Also in San Juan County

All Utah utilities

What to do next