Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in Great Falls, MT 59405
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Cascade County.
Historical measurement record needs context
- Largest possible serving system
- Great Falls City Of
- Source water
- Surface water + Groundwater
- County
- Cascade 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
No active flag
0 active health-based records
Measurements by utility
Each result belongs to a specific system.
Utility match
10 systems
Serves 60,000 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.
Great Falls City Of
MT0000525 · Surface water · 60,000 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
- 0.012 mg/L
- Action level
- 0.015 mg/L
80% of the listed benchmark
Monitoring period: Jan 1, 2026 to Jun 30, 2026
Violation history (0)
No record returned in this imported window. This is not a guarantee of tap-water safety.
Malmstrom Air Force Base
MT0000515 · Surface water · 8,850 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 (2)
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 mg/L
- Action level
- 0.015 mg/L
0% of the listed benchmark
Monitoring period: Jan 1, 2022 to Dec 31, 2024
Copper (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 2.21 mg/L
- Action level
- 1.3 mg/L
170% of the listed benchmark
Monitoring period: Jan 1, 2016 to Dec 31, 2018
Violation history (5)
| Rule | Status | Period |
|---|---|---|
| Revised Total Coliform Rule | Resolved | Nov 1, 2024 to Nov 30, 2024 |
| TTHM | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Total Haloacetic Acids (HAA5) | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Consumer Confidence Rule | Resolved | Jul 1, 2023 to Jul 26, 2023 |
| Lead and Copper Rule | Resolved | Dec 30, 2021 to Jan 5, 2022 |
Sun Prairie Village County
MT0000521 · Groundwater · 1,800 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
- 0.001 mg/L
- Action level
- 0.015 mg/L
7% of the listed benchmark
Monitoring period: Jan 1, 2021 to Dec 31, 2023
Violation history (2)
| Rule | Status | Period |
|---|---|---|
| Consumer Confidence Rule | Resolved | Oct 1, 2023 to Oct 19, 2023 |
| Consumer Confidence Rule | Resolved | Jul 1, 2023 to Oct 19, 2023 |
Prairie Water Company
MT0003539 · Surface water · 1,000 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 mg/L
- Action level
- 0.015 mg/L
0% of the listed benchmark
Monitoring period: Jan 1, 2022 to Dec 31, 2024
Violation history (7)
| Rule | Status | Period |
|---|---|---|
| Lead and Copper Rule | Resolved | Dec 30, 2024 to Jul 1, 2025 |
| Consumer Confidence Rule | Unaddressed | Oct 1, 2024 |
| Consumer Confidence Rule | Resolved | Jul 1, 2024 to Jul 1, 2025 |
| Consumer Confidence Rule | Unaddressed | Oct 1, 2023 |
| Revised Total Coliform Rule | Resolved | Sep 1, 2023 to Sep 30, 2023 |
| Consumer Confidence Rule | Unaddressed | Jul 1, 2023 |
| Lead and Copper Rule | Resolved | Dec 30, 2021 to Jul 1, 2025 |
Countryside Village Mhp Grt Fls
MT0004830 · Surface water · 600 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 (0)
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.
No comparable numerical result available
Federal SDWIS data does not provide a usable numerical result and benchmark for this profile. Missing data is not a pass. Check the serving utility's current Consumer Confidence Report.
Violation history (0)
No record returned in this imported window. This is not a guarantee of tap-water safety.
Gore Hill County Water Dist
MT0000232 · Groundwater · 500 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 (2)
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
- 0.004 mg/L
- Action level
- 0.015 mg/L
27% of the listed benchmark
Monitoring period: Jan 1, 2025 to Dec 31, 2025
Copper (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 2.12 mg/L
- Action level
- 1.3 mg/L
163% of the listed benchmark
Monitoring period: Jul 1, 1995 to Dec 31, 1995
Violation history (50)
| Rule | Status | Period |
|---|---|---|
| E. COLI | Resolved | Jul 22, 2025 to Jul 24, 2025 |
| Endrin | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| BHC-GAMMA | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Toxaphene | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| OXAMYL | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Dinoseb | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Carbofuran | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Atrazine | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| LASSO | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Heptachlor epoxide | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| 2,4,5-TP | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| HEXACHLOROBENZENE | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Pentachlorophenol | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Chlordane | 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 |
| Toxaphene | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Dalapon | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| OXAMYL | 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 |
| 2,4-D | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| HEXACHLOROBENZENE | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Benzo(a)pyrene | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Pentachlorophenol | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Chlordane | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Di(2-ethylhexyl) phthalate | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Benzo(a)pyrene | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Carbofuran | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Methoxychlor | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Simazine | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Picloram | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Di(2-ethylhexyl) adipate | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| 2,4-D | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| LASSO | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Dalapon | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Di(2-ethylhexyl) phthalate | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Picloram | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Hexachlorocyclopentadiene | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Heptachlor epoxide | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Methoxychlor | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Simazine | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Atrazine | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| 2,4,5-TP | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Di(2-ethylhexyl) adipate | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Heptachlor | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Heptachlor | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Combined Radium (-226 and -228) | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Gross Alpha, Excl. Radon and U | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Lead and Copper Rule | Resolved | Oct 1, 2023 to Dec 3, 2024 |
Bushard Water Company
MT0005164 · Surface water · 425 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 mg/L
- Action level
- 0.015 mg/L
0% of the listed benchmark
Monitoring period: Jan 1, 2025 to Jun 30, 2025
Violation history (5)
| Rule | Status | Period |
|---|---|---|
| Revised Total Coliform Rule | Resolved | Dec 1, 2025 to Dec 31, 2025 |
| Groundwater RuleHealth-based | Resolved | Oct 18, 2024 to Nov 8, 2024 |
| Revised Total Coliform Rule | Resolved | Oct 1, 2024 to Oct 31, 2024 |
| Revised Total Coliform Rule | Resolved | Jul 1, 2024 to Jul 31, 2024 |
| Revised Total Coliform Rule | Resolved | Jun 1, 2024 to Jun 30, 2024 |
Highwood Mobile Home Park
MT0004681 · Surface water · 400 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, 2011 to Jun 30, 2011
Violation history (1)
| Rule | Status | Period |
|---|---|---|
| Surface Water Treatment Rule | Resolved | Dec 1, 2023 to Dec 31, 2023 |
Sun Prairie Water District
MT0000571 · Groundwater · 350 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 mg/L
- Action level
- 0.015 mg/L
0% of the listed benchmark
Monitoring period: Jan 1, 2015 to Dec 31, 2017
Violation history (49)
| Rule | Status | Period |
|---|---|---|
| Nitrate-Nitrite | Resolved | Jan 1, 2025 to Dec 31, 2025 |
| Consumer Confidence Rule | Resolved | Oct 1, 2023 to Nov 1, 2023 |
| Consumer Confidence Rule | Resolved | Jul 1, 2023 to Oct 19, 2023 |
| BHC-GAMMA | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Toxaphene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Dalapon | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Di(2-ethylhexyl) adipate | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| OXAMYL | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Di(2-ethylhexyl) phthalate | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Picloram | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Hexachlorocyclopentadiene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Carbofuran | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Atrazine | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| LASSO | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Heptachlor epoxide | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| HEXACHLOROBENZENE | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Pentachlorophenol | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Chlordane | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| 1,2,4-Trichlorobenzene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| cis-1,2-Dichloroethylene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| DICHLOROMETHANE | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Vinyl chloride | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| 1,1,1-Trichloroethane | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| 1,2-Dichloropropane | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Trichloroethylene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| 1,1,2-Trichloroethane | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| CHLOROBENZENE | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Ethylbenzene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Styrene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Endrin | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| trans-1,2-Dichloroethylene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| 1,2-Dichloroethane | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Carbon tetrachloride | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Tetrachloroethylene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Heptachlor | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| p-Dichlorobenzene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Dinoseb | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Benzo(a)pyrene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| o-Dichlorobenzene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Benzene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Toluene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Simazine | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| 1,1-Dichloroethylene | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| 2,4-D | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| 2,4,5-TP | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Methoxychlor | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Xylenes, Total | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Revised Total Coliform Rule | Resolved | Dec 1, 2021 to Dec 31, 2021 |
| Consumer Confidence Rule | Resolved | Oct 1, 2021 to Oct 28, 2021 |
Great Falls Rv Park
MT0000027 · Surface water · 274 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 (0)
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.
No comparable numerical result available
Federal SDWIS data does not provide a usable numerical result and benchmark for this profile. Missing data is not a pass. Check the serving utility's current Consumer Confidence Report.
Violation history (0)
No record returned in this imported window. This is not a guarantee of tap-water safety.
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
A reported action-level record needs context. Check its monitoring period and the utility's current report.
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 →Nearby indexed reports
More local profiles in Great Falls
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
Water questions for Great Falls
Is tap water safe in Great Falls?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
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.