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St Marys Glacier WSD

What EPA’s and Colorado’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
451 people
Connections
292
Water source
Groundwater influenced by surface water
Based in
Wheat Ridge, CO
County
Clear Creek
Owner
Local government
The ZIP code it serves

80452

The short answer

1 result is above EPA’s legal limit, and 1 more is above the health goal. The worst: Copper, above the action level. 6 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2012 to 2021.

Total trihalomethanes (TTHM), haloacetic acids (HAA5), nitrate, chromium (total), arsenic, fluoride and uranium: Colorado’s own results, samples taken from Jan. 29, 2020 to Aug. 10, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit1

Copper

Comes from pipes, often your own

Above the action level

3.1ppm

90th percentile, 2021

In the latest period, 9 in 10 homes sampled were at or below 3.1 ppm, above EPA’s action level of 1.3 ppm.

What handles it

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

3.0ppb

90th percentile, 2026

In the latest period, 9 in 10 homes sampled were at or below 3.0 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

5.5ppb

Highest yearly average, 2020 to 2026

2026, one sample: 1.5 ppb

Averaged by year, the highest was 5.5 ppb, in 2022, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 1.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 46.7 ppb, in 2017.

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

3.5ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 3.5 ppb, in 2022, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 52.6 ppb, in 2017.

What handles it

No certification claim covers this compound yet.

Nitrate

Comes from the source

Below EPA’s limits

0.4ppm

Highest sample; found in 8 of 17

2026 average: 0.1 ppm

The highest sample, in 2020, was 0.4 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its two samples averaged 0.1 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.5 ppm, in 2016.

What handles it

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

Chromium (total)

Comes from the source

Below EPA’s limits

2.0ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 2.0 ppb, in 2025, below EPA’s legal limit of 100 ppb. In 2026, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.0 ppb, in 2017.

What handles it

3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Fluoride
  • Uranium

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: Copper Reduction, Lead Reduction

    For: Copper, Lead

  • NSF/ANSI 58

    Claims: Copper Reduction, Lead Reduction

    For: Copper, 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

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Interim Enhanced Surface Water Treatment RuleToo many readings in a month showed cloudiness above the filtration standard.EPA: Monthly Turbidity Exceed (Enhanced SWTR)June 1, 2024 to June 30, 2024—Resolved
Surface Water Treatment RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)April 1, 2024 to April 30, 2024—Resolved
Surface Water Treatment RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)Feb. 1, 2023 to Feb. 28, 2023—Resolved
Lead and Copper RuleOCCT/SOWT Treatment Installation/DemonstrationDec. 3, 2021—Resolved
Surface Water Treatment RuleWater drawn from a river, lake or reservoir was not filtered as required.EPA: Failure to Filter (SWTR)Oct. 2, 2019—Resolved
Groundwater RuleA significant problem found in a state inspection was not fixed on time.EPA: Failure To Address DeficiencyFeb. 28, 2018—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 27 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), nitrate, chromium (total), arsenic, fluoride and uranium results here are Colorado’s own from 2020 on, with EPA’s national file for 2012 to 2019. St Marys Glacier WSD’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; Colorado’s results run from Jan. 29, 2020 to Aug. 10, 2026.

Testing your own tap

St Marys Glacier WSD’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 Colorado certifies.

The 3 labs Colorado certifies closest to the area St Marys Glacier WSD serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • GeoWater Services

    Evergreen, CO · about 13 miles

    Certified for bacteria

  • Gilpin County Public Health Agency

    Black Hawk, CO · about 14 miles

    Certified for bacteria

  • Hazen Research

    Golden, CO · about 22 miles

    Certified for nitrate, lead and copper, metals, minerals and other inorganics, radioactivity

All 54 certified labs for Colorado

Sources

PWSID CO0110040. Rebuilt from EPA data on Oct. 18, 2026.

Nearby

All Colorado utilities

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