Is Great Falls tap water safe to drink?

Yes with good quality

Great Falls's tap water meets all EPA standards and scores well on our analysis. It is generally safe to drink though filtration can improve taste and provide extra precaution.

85/100
Purity Score
1
Issues Found
5.8 GPG
Hardness
Not detected
PFAS

1 Issue Detected in Great Falls

Arsenic Approaching Limit (0.2 mg/L)

EPA limit is 0.010 mg/L.

Arsenic info for Great Falls
Montana

594,015,940,459,405 · Missouri River

Drinking Water in Great Falls: 2026 Analysis

Low Risk Updated March 2026 58,505 residents
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85
Purity Score

Great Falls's drinking water is sourced from Missouri River and treated by City of Great Falls Water. This analysis covers PFAS testing, hardness, chlorine levels, lead risk, and overall safety.

Contaminant Levels

PFAS
ND
Lead
1.5 ppb
Nitrate
0.5 mg/L
Arsenic
0.2 mg/L
Hardness
5.8 gpg

Health Insights

  • 1
    Great Falls's water meets current EPA standards. Filtration can improve taste and provide extra safety.

Score

85 /100
Excellent
"Good" threshold (70)

Great Falls tap water is sourced from Missouri River and treated by City of Great Falls Water. Overall purity score: 85/100 (Excellent). Updated for 2026.

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Explore Great Falls Water Data

Forever Chemicals in Great FallsPFAS water report
Lead Risk in Great FallsLead water report
Great Falls Hardness ReportScale and minerals
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MontanaState rankings

Great Falls Water FAQ

Is Great Falls MT tap water safe to drink in 2026?
Great Falls tap water meets EPA federal drinking water standards and scores 85/100 (Excellent) on PurityMap for 2026. For most healthy adults the water is considered safe but point-of-use filtration adds an important layer of protection.
Does Great Falls MT use chlorine or chloramine for disinfection?
Great Falls uses chlorine as the primary disinfectant with a residual level of 0.8 ppm. Standard activated carbon filters including pitcher filters are effective at removing free chlorine taste and odor.
How hard is Great Falls MT water and what is the TDS level?
Great Falls water hardness is 5.8 grains per gallon (moderate) with a TDS of 200 ppm (fair). This level is unlikely to cause significant scale buildup in household plumbing.
Has PFAS been found in Great Falls MT drinking water?
Based on available EPA UCMR5 monitoring data as of 2026 PFAS have not been detected above EPA advisory levels in Great Falls drinking water.
What is the best water filter for Great Falls?
Based on Great Falls's water profile, we recommend the Clearly Filtered Water Pitcher. Great Falls water scores well overall. A pitcher filter provides extra precaution and improves taste for drinking and cooking.

Nearby Reports

BillingsMontana — 85/100MissoulaMontana — 85/100HelenaMontana — 85/100BozemanMontana — 85/100

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Data Sources

  • EPA SDWIS
  • EWG Tap Water Database
  • City of Great Falls Water CCR
  • USGS monitoring data

PurityMap compiles public data. Updated March 2026.

© 2026 PurityMap. For informational purposes only.

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