Great Falls
MT

Is Great Falls, MT Tap Water Safe to Drink?

Great Falls tap water meets federal Safe Drinking Water Act standards but 4 of 4 ZIP codes show detections above EPA health guidelines, primarily for lithium. A certified filter is recommended for households that want an additional layer of protection.

4Water systems
4ZIP codes
100%ZIPs above EPA guideline
Metro areaGreat Falls, MT
Latest data2025-11-10

Where Does Great Falls Get Its Water?

Water in Great Falls, MT is provided by 4 public water systems: CULLIGAN WATER CONDITIONING GREAT FALLS, GREAT FALLS CITY OF, MALMSTROM AIR FORCE BASE and SUN PRAIRIE VILLAGE COUNTY.

How Is Great Falls Tap Water Treated?

Treated water is disinfected using free chlorine and chloramines. Treatment includes conventional treatment (coagulation, flocculation, and filtration) and membrane filtration.

What's in Great Falls Tap Water?

The following contaminants were detected most frequently in Great Falls public water systems. 4 of 4 ZIP codes showed detections above EPA health guidelines.

ContaminantPeak detectedEPA guidelineZIPs detectedStatus
lithium 61.8 µg/L 10 µg/L 4 ZIPs Above guideline
PFTrDA 0.007 µg/L — 0 ZIPs Within guideline
6:2 FTS 0.005 µg/L — 0 ZIPs Within guideline
11Cl-PF3OUdS 0.005 µg/L — 0 ZIPs Within guideline
HFPO-DA 0.005 µg/L — 0 ZIPs Within guideline

Health Risk Profile for Great Falls

Based on EPA monitoring data, 4 of 4 ZIP codes in Great Falls have recorded detections above EPA health guidelines. Sensitive populations such as infants, pregnant individuals, and those with weakened immune systems may benefit from an additional layer of protection such as a certified point-of-use filter.

Best Filters for PFAS Water Profile

PFAS compounds are detected in this water supply. A reverse osmosis (RO) system or an activated-carbon filter specifically certified under NSF/ANSI P473 is required for reliable PFAS reduction. Standard pitcher and faucet filters without P473 certification do not remove PFAS.

Waterdrop G3P600 Reverse Osmosis System
Under-sink RO system

8-stage tankless RO system certified to NSF/ANSI 58, reduces 1,000+ contaminants including PFAS, lead, arsenic, fluoride, and nitrates.

Epic Pure XP Water Filter Pitcher
Pitcher filter

NSF-certified dual-layer filtration reduces 70+ contaminants including PFAS, lead, chlorine, microplastics, and bacteria.

See recommendations matched to your exact address: choose your ZIP code below.

Frequently Asked Questions about Great Falls Tap Water

Is Great Falls tap water safe to drink?

Great Falls tap water meets Safe Drinking Water Act requirements but 4 of 4 ZIP codes show contaminant levels above EPA health-based guidelines. A certified point-of-use filter adds an extra layer of protection.

What contaminants are in Great Falls tap water?

The most commonly detected contaminants in Great Falls water systems include: lithium, PFTrDA, 6:2 FTS. See the ZIP-level reports for exact measurements and EPA guideline comparisons.

Where does Great Falls get its drinking water?

Great Falls receives water from 4 public water systems, including CULLIGAN WATER CONDITIONING GREAT FALLS.

Do I need a water filter in Great Falls?

If your ZIP code is among those with detections above EPA health guidelines, choose a filter certified for the specific contaminants shown in your ZIP report. Reverse osmosis is generally the broadest option for PFAS, lithium, and many other dissolved contaminants.

How often is Great Falls tap water tested?

Public water systems in Great Falls are required by the EPA to test for regulated contaminants on schedules ranging from daily (for microbials and disinfectants) to annual or triennial (for many chemical contaminants). Results are published in annual Consumer Confidence Reports (CCRs). The data on this page reflects the most recent available EPA monitoring results, with the latest sample date of 2025-11-10.

Tap water reports by ZIP in Great Falls

Water utilities serving Great Falls, MT

Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.

Modeled boundaries are shown with a dashed outline.

Also covers / overlaps with