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Town of Hysham

What EPA’s and Montana’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
262 people
Connections
184
Water source
Surface water
Based in
Hysham, MT
County
Treasure
Owner
Local government
The ZIP code it serves

59038

The short answer

1 result is above the health goal. The worst: Arsenic, above the health goal. 7 health-based violations since 2016.

What handles it

What was found

Copper: EPA’s file records a utility’s copper only when it exceeds the action level. The last here was 1.9 ppm, for the period ending Dec. 31, 2014. None since is on file, so it is not counted as a current finding.

Arsenic, total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, nitrate and chromium (total): Montana’s own results, samples taken from Aug. 12, 2020 to Dec. 17, 2025, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal1

Arsenic

Comes from the source

Above the health goal

6.0ppb

Highest yearly average, 2022 to 2025

2025: not found

Averaged by year, the highest was 6.0 ppb, in 2023: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2025, 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 7.0 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

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

75ppb

Highest yearly average, 2020 to 2025

2025 average: 35.5 ppb

Averaged by year, the highest was 75 ppb, in 2020, below EPA’s legal limit of 80 ppb. In 2025, the latest year on file, its two samples averaged 35.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 39.7 ppb, in 2012.

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

49ppb

Highest yearly average, 2020 to 2025

2025, one sample: 41 ppb

Averaged by year, the highest was 49 ppb, in 2021, below EPA’s legal limit of 60 ppb. In 2025, the latest year on file, its one sample was 41 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 42 ppb, in 2017.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.3ppm

Highest yearly average, 2025

Averaged by year, the highest was 0.3 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. That is the only year on file.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.21ppm

Highest sample; found in 6 of 6

2025, one sample: 0.14 ppm

The highest sample, in 2021, was 0.21 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, its one sample was 0.14 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.09 ppm, in 2017.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Chromium (total)
  • 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

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: 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 reverse osmosis systems, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Interim Enhanced Surface Water Treatment RuleOne cloudiness reading was above the maximum allowed.EPA: Single Turbidity Exceed (Enhanced SWTR)July 1, 2025 to July 31, 2025—Resolved
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, 2025 to June 30, 2025—Resolved
Surface Water Treatment RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)Dec. 1, 2022 to Dec. 31, 2022—Archived
Surface Water Treatment RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)Oct. 1, 2022 to Oct. 31, 2022—Archived
Surface Water Treatment RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)Sept. 1, 2022 to Sept. 30, 2022—Archived
Surface Water Treatment RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)Aug. 1, 2022 to Aug. 31, 2022—Archived
Surface Water Treatment RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)April 1, 2022 to April 30, 2022—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, total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, nitrate and chromium (total) results here are Montana’s own from 2020 on, with EPA’s national file for 2012 to 2019. Town of Hysham’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; Montana’s results run from Aug. 12, 2020 to Dec. 17, 2025.

Testing your own tap

Town of Hysham’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 Montana certifies.

The lab Montana certifies closest to the area Town of Hysham serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Energy Laboratories, Inc.

    Billings, MT · about 71 miles

    Certified for bacteria, minerals and other inorganics, organic chemicals

    (800) 735-4489

Montana State Environmental Laboratory: Private well testing packages for bacteria, metals, nutrients, anions, organic chemicals and more, open to the public. Samples can be mailed, sent by the lab's free courier, or dropped off at the lab. Environmental Laboratory, Montana Department of Public Health and Human Services.

All 36 certified labs for Montana

Sources

PWSID MT0000428. Rebuilt from EPA data on Oct. 18, 2026.

Nearby

All Montana utilities

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