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G and M Mobile Home Park

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
30 people
Connections
13
Water source
Groundwater
Based in
Thornton, CO
County
Rio Grande
Owner
Private
Hardness
Moderately hard

The short answer

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

What handles it

What was found

Arsenic, uranium, nitrate, chromium (total), fluoride, total trihalomethanes (TTHM) and haloacetic acids (HAA5): Colorado’s own results, samples taken from Dec. 18, 2024 to Sept. 24, 2026.

Above the health goal2

Arsenic

Comes from the source

Above the health goal

7.0ppb

Highest yearly average, 2024 to 2025

2025 average: 3.9 ppb

Averaged by year, the highest was 7.0 ppb, in 2024: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2025, the latest year on file, its four samples averaged 3.9 ppb.

What handles it

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

Uranium

Comes from the source

Above the health goal

4.4ppb

Highest yearly average, 2024 to 2025

2025 average: 3.7 ppb

Averaged by year, the highest was 4.4 ppb, in 2024: below EPA’s legal limit of 30 ppb, but above its health goal of zero. In 2025, the latest year on file, its four samples averaged 3.7 ppb.

What handles it

Below EPA’s limits4

Nitrate

Comes from the source

Below EPA’s limits

5.5ppm

Highest sample; found in 8 of 8

2026 average: 4.8 ppm

The highest sample, in 2025, was 5.5 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its two samples averaged 4.8 ppm.

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

1.0ppb

Highest yearly average, 2024 to 2025

Averaged by year, the highest was 1.0 ppb, in 2025, below EPA’s legal limit of 100 ppb. Its highest single sample was 2.0 ppb. That was also the latest year on file.

What handles it

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.021ppm

Highest yearly average, 2024 to 2025

Averaged by year, the highest was 0.021 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.082 ppm. That was also the latest year on file.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

0.37ppb

Highest yearly average, 2025 to 2026

2026: not found

Averaged by year, the highest was 0.37 ppb, in 2025, below EPA’s legal limit of 80 ppb. Its highest single sample was 0.59 ppb. In 2026, 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”
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

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

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

  • NSF/ANSI 58

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

    For: Arsenic, Uranium

    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 reverse osmosis systems, ranked

Hardness

Moderately hard, typically 110 mg/L (6.4 grains per gallon), across 2 sampling points, in 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 at 6.4 grains per gallon, salt includedSoftener or salt-free conditioner?Colorado water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Stage 1 Disinfectants and Disinfection Byproducts RuleTreatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. OperatorSept. 1, 2024—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 81 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Arsenic, uranium, nitrate, chromium (total), fluoride, total trihalomethanes (TTHM) and haloacetic acids (HAA5) results here are Colorado’s own from 2024 on, with EPA’s national file for 2012 to 2019. G and M Mobile Home Park’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 Dec. 18, 2024 to Sept. 24, 2026.

Testing your own tap

G and M Mobile Home Park’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.

No lab Colorado certifies is within 75 miles of the area G and M Mobile Home Park serves on the state’s list. Some take samples by mail; the state’s page lists them all.

All 54 certified labs for Colorado

Sources

PWSID CO0153300. Rebuilt from EPA data on Oct. 18, 2026.

Also in Rio Grande County

All Colorado utilities

What to do next