Tap water quality for ZIP 59405

4 community water systems linked to this ZIP, largest first.

⚠ Some links below are based on the utility's mailing address, not its mapped service area, and may be approximate.

What this means for you in ZIP 59405

Is it safe to drink right now?
Based on the latest EPA data, City of Great Falls has no unresolved health-based violations from the past year. Water that meets federal standards is generally considered safe to drink for most healthy people.
Should I use a filter?
Yes, we recommend considering one. Lead results are high enough that a certified lead-reduction filter is a sensible precaution.
What kind of filter?
For lead, choose NSF/ANSI 53 certified for lead reduction (or RO under 58). See matched standards and product picks.

This is general information from public EPA data, not medical advice. Lead often comes from a home’s own pipes, so only a test of your tap can tell your exposure. If you are pregnant, caring for an infant, or have a weakened immune system, ask your doctor or health department.

Shown for the largest system linked to this ZIP. Check your water bill to confirm your provider.

Filters matched to City of Great Falls

FILTER PICKS

Look for filters certified (NSF, IAPMO or WQA) to these standards for the specific contaminant. Buttons open the maker’s page or an Amazon search; use “Check NSF listing” to verify a model’s claims. No affiliate links yet — grades are never sold.

Lead

NSF/ANSI 53NSF/ANSI 58 (RO)
Aquasana Claryum 3-Stage Under Sink ~$280–350
Under-sink carbon filter; check its listing for lead and PFOA/PFOS claims.
View on Aquasana →
Check NSF listing · Not an affiliate link · disclosure
Waterdrop Undersink WD-UA ~$80–120
Undersink carbon block; verify the specific contaminant claims.
Search on Amazon →
Check NSF listing · Not an affiliate link · disclosure
Waterdrop G3 / G3P600 RO ~$300–500
Tankless RO; RO broadly reduces nitrate, fluoride, arsenic and many PFAS — confirm the certificate lists yours.
Search on Amazon →
Check NSF listing · Not an affiliate link · disclosure

Chlorine/chloramine taste

NSF/ANSI 42
Aquasana Clean Water Pitcher ~$35
Pitcher for chlorine taste/odor; check the NSF/ANSI 42 listing for the exact model.
Search on Amazon →
Check NSF listing · Not an affiliate link · disclosure
Brita Elite Filter ~$20–40
Common faucet/pitcher option; confirm the 42 claim on the box.
View on Brita →
Check NSF listing · Not an affiliate link · disclosure

Annual water quality report

Utilities must publish a Consumer Confidence Report every year by July 1. Find it on the utility’s website or ask them directly; EPA explains how. · Full report →

Water systems for this ZIP

A

City of Great Falls

Serves 60,000 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile above the new 10 ppb action level (LCRI, effective Nov 1, 2027); Lead 90th percentile below the action level (2026).
B

Malmstrom Air Force Base

Serves 8,850 people · Surface water · Full report →
No health-based violations in the last 5 years; 5 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
B

Pleasant Park Community Inc

Serves 125 people · Groundwater · Full report →
No health-based violations in the last 5 years; 7 monitoring/reporting violations; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2023).
A

Grassland Colony

Serves 80 people · Groundwater · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).
COMING SOONGet violation alerts for ZIP 59405
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