Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in West Yellowstone, MT 59758
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Gallatin County.
1 active health-based record(s) across possible systems
- Largest possible serving system
- West Yellowstone Town Of
- Source water
- Groundwater
- County
- Gallatin County
- Profile updated
Your tap water
What does the utility report?
Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.
Utility hardness unavailable in this index
Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.
Find an official utility report →At a glance
What the current records say
EPA quarter 2026Q2
All possible systems
Review needed
1 active health-based record
Measurements by utility
Each result belongs to a specific system.
Utility match
4 systems
Serves 9,899 people system-wide
Match the name on your water bill
Your utility’s measurements and compliance records
These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.
EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.
West Yellowstone Town Of
MT0003136 · Groundwater · 9,899 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
No active health-based record in this imported snapshot
Find this utility’s official report →Measurements (1)
An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
Lead (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 0.0013 mg/L
- Action level
- 0.015 mg/L
8% of the listed benchmark
Monitoring period: Jan 1, 2022 to Dec 31, 2024
Violation history (2)
| Rule | Status | Period |
|---|---|---|
| Fluoride | Archived | Jul 1, 2021 to Sep 30, 2021 |
| Arsenic | Resolved | Apr 1, 2021 to Jun 30, 2021 |
Hebgen Lake Estates Co Water Sewer Distr
MT0001983 · Groundwater · 230 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
No active health-based record in this imported snapshot
Find this utility’s official report →Measurements (1)
An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
Lead (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 0.013 mg/L
- Action level
- 0.015 mg/L
87% of the listed benchmark
Monitoring period: Jan 1, 2025 to Dec 31, 2025
Violation history (3)
| Rule | Status | Period |
|---|---|---|
| Lead and Copper Rule | Resolved | Dec 30, 2024 to Feb 4, 2025 |
| Gross Alpha, Excl. Radon and U | Resolved | Jul 1, 2022 to Aug 14, 2022 |
| Combined Radium (-226 and -228) | Resolved | Jul 1, 2022 to Aug 14, 2022 |
Yellowstone Holiday Wtr And Sew District
MT0001326 · Groundwater · 85 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
No active health-based record in this imported snapshot
Find this utility’s official report →Measurements (1)
An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
Lead (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 0.003 mg/L
- Action level
- 0.015 mg/L
20% of the listed benchmark
Monitoring period: Jan 1, 2023 to Dec 31, 2025
Violation history (0)
No record returned in this imported window. This is not a guarantee of tap-water safety.
Fishermans Village Subdivision
MT0004722 · Groundwater · 25 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
1 reported active health-based record(s) for this system
Find this utility’s official report →Measurements (1)
An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
Lead (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 4.5e-4 mg/L
- Action level
- 0.015 mg/L
3% of the listed benchmark
Monitoring period: Jan 1, 2025 to Jun 30, 2025
Violation history (191)
| Rule | Status | Period |
|---|---|---|
| Revised Total Coliform RuleHealth-based | Unaddressed | Jan 1, 2026 |
| E. COLI | Resolved | Nov 15, 2025 to Nov 18, 2025 |
| Consumer Confidence Rule | Unaddressed | Oct 1, 2025 |
| Endrin | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Toxaphene | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| OXAMYL | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Simazine | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Di(2-ethylhexyl) phthalate | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Dinoseb | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| LASSO | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Heptachlor | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Heptachlor epoxide | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| 2,4,5-TP | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| HEXACHLOROBENZENE | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Benzo(a)pyrene | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Pentachlorophenol | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Hexachlorocyclopentadiene | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Picloram | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Methoxychlor | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Chlordane | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Dalapon | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Atrazine | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Di(2-ethylhexyl) adipate | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| BHC-GAMMA | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Carbofuran | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| 2,4-D | Resolved | Oct 1, 2025 to Dec 31, 2025 |
| Consumer Confidence Rule | Unaddressed | Jul 1, 2025 |
| BHC-GAMMA | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Toxaphene | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Dalapon | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| OXAMYL | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Simazine | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Di(2-ethylhexyl) phthalate | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Dinoseb | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Atrazine | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Heptachlor | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| 2,4,5-TP | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| HEXACHLOROBENZENE | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Di(2-ethylhexyl) adipate | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Hexachlorocyclopentadiene | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Endrin | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| 2,4-D | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Methoxychlor | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Benzo(a)pyrene | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Lead and Copper Rule | Resolved | Jul 1, 2025 to Jun 17, 2025 |
| Heptachlor epoxide | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Pentachlorophenol | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| LASSO | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Carbofuran | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Chlordane | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Picloram | Resolved | Jul 1, 2025 to Sep 30, 2025 |
| Lead and Copper Rule | Resolved | Apr 1, 2025 to Sep 29, 2025 |
| Endrin | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| BHC-GAMMA | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Methoxychlor | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Toxaphene | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Dalapon | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Di(2-ethylhexyl) adipate | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Simazine | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Dinoseb | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Hexachlorocyclopentadiene | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Carbofuran | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Heptachlor | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| 2,4-D | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| 2,4,5-TP | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| HEXACHLOROBENZENE | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Benzo(a)pyrene | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Chlordane | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Pentachlorophenol | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Gross Alpha, Excl. Radon and U | Resolved | Jan 1, 2025 to Jan 7, 2025 |
| OXAMYL | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Heptachlor epoxide | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| LASSO | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Di(2-ethylhexyl) phthalate | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Picloram | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Atrazine | Resolved | Jan 1, 2025 to Mar 31, 2025 |
| Dalapon | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| OXAMYL | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Simazine | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Dinoseb | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Hexachlorocyclopentadiene | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Carbofuran | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Atrazine | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| LASSO | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Heptachlor epoxide | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| 2,4-D | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| 2,4,5-TP | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Benzo(a)pyrene | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Pentachlorophenol | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Chlordane | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Gross Alpha, Excl. Radon and U | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Endrin | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| BHC-GAMMA | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Toxaphene | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| HEXACHLOROBENZENE | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Picloram | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Methoxychlor | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Di(2-ethylhexyl) phthalate | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Heptachlor | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Di(2-ethylhexyl) adipate | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Combined Radium (-226 and -228) | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Endrin | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| BHC-GAMMA | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Methoxychlor | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Di(2-ethylhexyl) adipate | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| OXAMYL | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Di(2-ethylhexyl) phthalate | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Dinoseb | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Hexachlorocyclopentadiene | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Atrazine | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Heptachlor | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| 2,4,5-TP | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Chlordane | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Dalapon | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Toxaphene | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Pentachlorophenol | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Carbofuran | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Heptachlor epoxide | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Benzo(a)pyrene | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| LASSO | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| 2,4-D | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Simazine | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Gross Alpha, Excl. Radon and U | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| HEXACHLOROBENZENE | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Picloram | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Revised Total Coliform Rule | Resolved | Jun 1, 2024 to Jun 30, 2024 |
| Revised Total Coliform RuleHealth-based | Resolved | May 28, 2024 to Jun 20, 2024 |
| Revised Total Coliform Rule | Resolved | May 1, 2024 to May 31, 2024 |
| E. COLI | Resolved | Apr 30, 2024 to Sep 10, 2024 |
| Endrin | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Methoxychlor | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Dalapon | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Di(2-ethylhexyl) adipate | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Simazine | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Di(2-ethylhexyl) phthalate | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Picloram | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Carbofuran | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Heptachlor | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| 2,4-D | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| 2,4,5-TP | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Benzo(a)pyrene | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Pentachlorophenol | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| OXAMYL | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| LASSO | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Chlordane | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| HEXACHLOROBENZENE | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Combined Radium (-226 and -228) | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Heptachlor epoxide | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Hexachlorocyclopentadiene | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Toxaphene | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| BHC-GAMMA | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Atrazine | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Dinoseb | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Gross Alpha, Excl. Radon and U | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| cis-1,2-Dichloroethylene | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| o-Dichlorobenzene | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| Vinyl chloride | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| 1,1-Dichloroethylene | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| trans-1,2-Dichloroethylene | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| 1,1,1-Trichloroethane | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| Tetrachloroethylene | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| CHLOROBENZENE | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| Benzene | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| Ethylbenzene | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| 1,1,2-Trichloroethane | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| Xylenes, Total | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| 1,2-Dichloropropane | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| Carbon tetrachloride | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| Toluene | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| 1,2-Dichloroethane | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| DICHLOROMETHANE | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| Styrene | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| p-Dichlorobenzene | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| 1,2,4-Trichlorobenzene | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| Trichloroethylene | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| Revised Total Coliform Rule | Resolved | Oct 1, 2023 to Jan 9, 2024 |
| Revised Total Coliform Rule | Resolved | May 1, 2023 to May 31, 2023 |
| Chromium | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Fluoride | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Mercury | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Antimony, Total | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Beryllium, Total | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Arsenic | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Barium | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Selenium | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Cadmium | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Nickel | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Thallium, Total | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| E. COLI | Resolved | Sep 7, 2022 to Sep 19, 2022 |
| Revised Total Coliform RuleHealth-based | Resolved | Aug 1, 2022 to Aug 31, 2022 |
| Revised Total Coliform RuleHealth-based | Resolved | May 2, 2022 to Mar 26, 2024 |
Hardness estimate unavailable
No responsible local estimate yet
We did not find enough qualifying recent USGS hardness observations within 25 miles of this ZIP centroid. We leave the value blank instead of substituting a state average. Ask the serving utility or test the household tap for a property-specific result.
Evidence-first next steps
Confirm the problem before choosing treatment
This profile can help you ask the right question. It cannot select equipment for a property without a current result from the serving utility or the tap.
Confirm the serving system
ZIP boundaries and utility service areas do not perfectly match. Verify the system on a water bill before relying on system-wide records.
Read the current utility report
An active health-based record is present. Follow the utility's current notice and public-health instructions.
Find an official utility report →Test for the decision you face
Ask the utility for hardness or test at the tap. For health concerns, use a certified laboratory and targeted analysis.
Convert your hardness test result →Frequently asked
Water questions for West Yellowstone
Is tap water safe in West Yellowstone?+
EPA ECHO reports 1 active health-based violation among the associated community water systems. Review the affected utility's current notice and Consumer Confidence Report.
How hard is the water?+
Utility-reported hardness is unavailable in this index. Regional samples do not establish tap-water hardness. Ask your provider or test your tap.
Do I need a water softener?+
Confirm hardness at your tap and consider actual scale or spotting before choosing treatment. Regional environmental values cannot determine whether you need a softener. A softener addresses hardness, not every contaminant.