Skip to content
TapBuff
ZIP

Arrow Creek Trailer Court

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
75 people
Connections
25
Water source
Groundwater
Based in
Billings, MT
County
Yellowstone
Owner
Private
Hardness
Soft
The ZIP code it serves

59006

The short answer

1 result is above EPA’s legal limit, and 1 more is above the health goal. The worst: Nitrate, above the legal limit. 8 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2019 to 2025.

Nitrate, haloacetic acids (HAA5), fluoride, total trihalomethanes (TTHM), arsenic, chromium (total) and uranium: Montana’s own results, samples taken from April 27, 2020 to Aug. 24, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit1

Nitrate

Comes from the source

Above the legal limit

16.2ppm

Highest sample; found in 31 of 31

2026 average: 3.1 ppm

In 2023, five samples were above EPA’s legal limit of 10 ppm, the highest 16.2 ppm. The next sample at the same point, within 30 days, kept the average above the limit for three; one came back under and one has no follow-up sample on file within 30 days. In 2026, the latest year on file, its three samples averaged 3.1 ppm. EPA recorded a violation for nitrate at this utility in 2023. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 16.4 ppm, in 2015, and EPA recorded violations in 2015 and 2016.

What handles it

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

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

4.0ppb

90th percentile, 2025

In the latest period, 9 in 10 homes sampled were at or below 4.0 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 limits3

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

2.6ppb

Highest yearly average, 2021 to 2025

2025: not found

Averaged by year, the highest was 2.6 ppb, in 2022, below EPA’s legal limit of 60 ppb. 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 5.4 ppb, in 2018.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.1ppm

Highest yearly average, 2022 to 2024

2024: not found

Averaged by year, the highest was 0.1 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. In 2024, the latest year on file, it wasn’t found in its one sample.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

1.4ppb

Highest yearly average, 2021 to 2025

2025, one sample: 0.73 ppb

Averaged by year, the highest was 1.4 ppb, in 2022, below EPA’s legal limit of 80 ppb. Its highest single sample was 2.7 ppb. In 2025, the latest year on file, its one sample was 0.73 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 12.9 ppb, in 2014.

What handles it

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

    For: Nitrate, Lead

  • NSF/ANSI 58

    Claims: Nitrate/Nitrite Reduction, Lead Reduction

    For: Nitrate, Lead

    Other certifiers’ wording: Nitrate

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 reverse osmosis systems, ranked

The best water filters for lead, ranked

Hardness

Soft, 16 mg/L (0.9 grains per gallon), at its one sampling point, in 2024.

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 0.9 grains per gallon, salt includedSoftener or salt-free conditioner?Montana water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Groundwater RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)Oct. 1, 2025 to Oct. 31, 2025—Resolved
Lead and Copper RuleA required study or plan for corrosion control was not done on time.EPA: OCCT/SOWT Study/RecommendationApril 1, 2023—Resolved
Nitrate-NitriteA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleApril 1, 2023 to June 30, 202311.9 MG/LResolved
Nitrate-NitriteA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleJan. 1, 2023 to March 31, 202311.9 MG/LResolved
Lead and Copper RuleRequired information about lead was not given to customers.EPA: Public EducationOct. 16, 2022—Resolved
Nitrate-NitriteA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleJuly 1, 2016 to Sept. 30, 201614.2 MG/LResolved
Nitrate-NitriteA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleJune 1, 2016 to June 30, 201611.2 MG/LResolved
Nitrate-NitriteA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleMay 1, 2016 to May 31, 201610.6 MG/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 38 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Nitrate, haloacetic acids (HAA5), fluoride, total trihalomethanes (TTHM), arsenic, chromium (total) and uranium results here are Montana’s own from 2020 on, with EPA’s national file for 2012 to 2019. Arrow Creek Trailer Court’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 April 27, 2020 to Aug. 24, 2026.

Testing your own tap

Arrow Creek Trailer Court’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 Arrow Creek Trailer Court 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 24 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 MT0004507. Rebuilt from EPA data on Oct. 18, 2026.

Also in Yellowstone County

All Montana utilities

What to do next