Is Hardin, MT tap water safe?
The short answer
Neither of the 2 utilities serving Hardin has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Montana’s records.
City of Hardin, which serves the most people here, has 2 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 33 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.
A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Hardin’s ZIP codes, from EPA’s estimates.
- Open report
City of Hardin
Montana · serves 3,500 people · under 100 in Hardin
2 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 33 ppb, above EPA’s health benchmark.
No health-based violations since 2016
- Open report
Yellowtail Dam Gc System
Montana · serves 125 people · lists Hardin among the places it serves
3 results above the health goal. The worst: Lead at 11 ppb, above the health goal.
No health-based violations since 2016
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in City of Hardin’s water, which serves the most people here. Another utility’s report names what handles its own results.
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
Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Arsenic
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Brondell Capella RC250 Reverse Osmosis System
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Water testing near Hardin
The 2 labs Montana certifies closest to Hardin, 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 41 miles
Certified for bacteria, minerals and other inorganics, organic chemicals
PACE Analytical-Sheridan
Sheridan, WY · about 72 miles
Certified for bacteria, minerals and other inorganics, organic chemicals
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 MontanaZIP codes in Hardin
Which ZIP codes are in Hardin: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: Montana Department of Public Health and Human Services, Water Laboratory Certification Program, certified laboratories; distances from the Census 2020 ZIP code tabulation area gazetteer.
Near Hardin
Towns nearby with a page of their own.
What to do next
- Read City of Hardin’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About LithiumWhat it does to health, where it comes from, and the certification claim that addresses it.About Lithium
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water