City water profile

Water hardness in West Yellowstone

Find official utility reports, understand hardness, and check the water system serving your home in West Yellowstone, Montana.

Utility-reported hardness

Not yet available

Check your provider and source →

State comparison: Unavailable
Evidence comparison rank: —
Matched utilities: 4
Active health records: 1

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 →

Convert a hardness result →Test your tap →

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

Below action level

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)

Imported violation history for West Yellowstone Town Of
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

Below action level

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)

Imported violation history for Hebgen Lake Estates Co Water Sewer Distr
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

Below action level

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

Below action level

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)

Imported violation history for Fishermans Village Subdivision
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

City summary

What the indexed records say

West Yellowstone has 1 published ZIP profile across Gallatin County. No qualifying nearby hardness observation is available for the city.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs

Moderately hard0 ZIPs

Hard0 ZIPs

Very hard0 ZIPs

0 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: — miles
Profiles with evidence: 0/1

Confidence labels

High: 0Moderate: 0Low: 0

Observation window: unavailable to unavailable.

ZIP directory

Water reports in West Yellowstone

Open a ZIP for site-level provenance and measurements.

ZIP code

59758

No estimate

—

Nearest site: — mi
Confidence: —

View full ZIP evidence →

Practical next steps

Move from index to evidence

1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
3. Use a measured hardness result. Confirm health concerns or treatment sizing with the right method.

Continue comparing

Other Montana communities

Bozeman

Gallatin County

— No median

Babb

Glacier County

59 PPM median

Basin

Jefferson County

38 PPM median

Bigfork

Lake County

193 PPM median

Clancy

Jefferson County

38 PPM median

Colstrip

Rosebud County

629 PPM median

Search all 133 Montana cities →

Questions people ask

About water in West Yellowstone

Is the water hard?

Check the utility-reported result above when available. Nearby environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.