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WaterSafeCheck
Official EPA SDWIS Verified ReportWater Quality & Testing GuideHistorical Record: No Recorded SDWIS Violations

ZIP Code 59625 Water Quality & Testing Report

Helena, MT · Lewis and Clark County County · Updated for 2026

Sahajul HaqueCompiled & verified by Sahajul Haque from official EPA SDWIS records
Public Health & Medical Notice: Drinking water quality data on this page reflects historical compliance records submitted under the Safe Drinking Water Act. This information does not constitute medical advice or a real-time safety guarantee. If you are pregnant, nursing, preparing infant formula, or immunocompromised, consult a healthcare provider. Boiling water kills biological pathogens, but does NOT remove chemical contaminants like lead, arsenic, or PFAS.
Quick EPA Verified Answer

Is Tap Water Safe to Drink in ZIP 59625 (Helena, MT)?

Caution / Filtration Recommended: Tap water in ZIP code 59625 (Helena, MT) has compliance concerns, earning an EPA Safety Grade of F (37/100) due to 11 health violation(s) and 3.0 ppb lead. While treated by Helena Water System, residents are advised to use an NSF/ANSI 53 certified water filter for drinking and cooking.

Safety Score
F

Water Safety Grade

Failing — Serious compliance issues

Health Violations

11

Total Violations

36

Lead Risk

N/A

Contaminants

2

About Tap Water in ZIP Code 59625

Tap water in ZIP code 59625 (Helena, MT) is distributed by Helena Water System (EPA ID: MT0000241), serving approximately 32,091 residents. Based on EPA Safe Drinking Water Act compliance records, this system receives a water safety grade of F with a composite quality score of 37/100.

Water System

Helena Water System

EPA ID: MT0000241

Water Source

Surface Water

Population Served

32,091 residents

County

Lewis and Clark County County, Montana

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Lead Levels in ZIP 59625

EPA action level: 15 ppb | Public health goal: 0 ppb

Lead Level: 3.0 ppb — Very Low

The 90th percentile lead level in 59625 is 3.0 ppb. This meets the EPA action level of 15 ppb. Health experts recommend a target of 0 ppb for optimal safety.
Lead Level (90th percentile)
3.00 ppb (0.003 mg/L)
Copper Level (90th percentile)

EPA action level: 1.3 mg/L

1.4 mg/L
Lead Exposure Risk Rating
Unknown
Note: Lead levels above are the 90th percentile from EPA monitoring — meaning 90% of samples were at or below this level. Even "undetected" tap water lead doesn't account for lead leaching from home plumbing. If your home was built before 1986, individual tap testing is recommended.
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Water Hardness & Mineral Content

Grains per gallon (GPG) & Parts per million (PPM / mg/L)

Classification: Very Hard10.7 GPG · 183 mg/L

Water in ZIP 59625 is Very Hard (183 mg/L / 10.7 GPG). High concentrations of dissolved limestone minerals cause severe mineral buildup, stiff laundry, dry skin, and premature water heater wear.

Recommendation: A whole-home water softener system is strongly recommended to protect plumbing and home appliances.
Hardness (GPG)

Grains per gallon

10.7 GPG
Hardness (PPM / mg/L)

Parts per million CaCO3

183 mg/L
Appliance Scaling Risk
High / Severe

Official EPA SDWIS Database Entry

Utility: Helena Water System · PWSID: MT0000241

Verify on EPA.gov
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Violation History

Past 5 years — EPA SDWIS data

Helena Water System has recorded 11 health-based violations out of 36 total violations over the past 5 years. 8 violations remain unresolved in EPA tracking records.

Total Violations (5 yr)
36
Health-Based Violations
11
Unresolved Violations
8
Boil Water Advisories
0
Compliance Risk
Critical

Regulatory compliance risk for this utility is rated Critical based on past reporting and enforcement records.

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Contaminants Detected

Contaminants with health-based violations on record

EPA records identify 2 contaminants with health-based violations in the past 5 years: Total Trihalomethanes (TTHM), Stage 1 DBP Rule.

Total Trihalomethanes (TTHM)Stage 1 DBP Rule

⚖ Enforcement Actions

EPA or state regulators have issued 10 enforcement actions to address compliance lapses.
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Water Source & Environmental Factors

Surface Water

This system draws water from lakes, rivers, or reservoirs. Surface water is treated to remove sediment, microorganisms, and chemical contaminants before reaching taps.

Water Source Type
Surface Water
EPA Radon Zone

Highest potential

Zone 1

EPA Radon Zone 1 — highest potential for radon in indoor air. Homeowners should test their home for radon and consider mitigation if levels exceed 4 pCi/L.

Water Quality Testing in ZIP 59625

Tap Water & Well Testing Recommendations

Residents in ZIP code 59625 served by Helena Water System can test tap water or private well systems to verify water purity. Testing detects hidden contaminants before they impact family health.

Tap Water Testing Steps

  • 1.Conduct a certified lead check if your home was constructed before 1986.
  • 2.Use certified lab testing kits rather than uncalibrated test strips for regulated compliance.
  • 3.Sample water from both your kitchen faucet and water heater to compare line purity.

Private Well Testing Steps

  • •Test for Coliform bacteria and Nitrates annually.
  • •Test for heavy metals, radon, and PFAS every 3 years.
  • •Send samples to a state-certified drinking water laboratory recognized by Montana Department of Environmental Quality.
Certified Lab Testing: Always use an EPA-certified drinking water laboratory in MT for formal legal or real estate compliance testing.

🛡 What Should You Do? — ZIP 59625 Recommendations

  • 🚨 Install a certified NSF/ANSI 53 or 58 (reverse osmosis) filter immediately for drinking and cooking
  • 🚨 Do not give unfiltered water to children, pregnant women, or immunocompromised individuals
  • 🚨 Contact Helena Water System to request the current violation status and corrective action plan
  • 🚨 Report concerns to your state environmental agency or call the EPA hotline: 1-800-426-4791
  • 🚨 Consider having your home's tap water independently tested by a certified lab

Recommended Water Treatment Systems:

REQUIRED FOR SAFETY
🏺

NSF 53 Lead Pitcher Filter

Certified to remove lead. Recommended for immediate protection.

Lead Filter Guide →
STRONGLY RECOMMENDED
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NSF 58 Under-Sink RO System

Reverse Osmosis system certified to remove PFAS, heavy metals, and viruses.

RO System Guide →

Frequently Asked Questions — ZIP 59625 Water Quality

Is tap water safe to drink in ZIP code 59625?+
Tap water in 59625 has a below-average safety grade of F due to compliance issues. We recommend using a certified water filter for drinking and cooking.
How do I get my water tested in ZIP 59625 (Helena, MT)?+
To test water quality in ZIP 59625, you can order a certified drinking water test kit or send water samples to an EPA/NELAP certified laboratory in MT. Certified testing checks for lead, coliform bacteria, nitrates, hardness, and PFAS that standard test strips miss. Contact Montana Department of Environmental Quality for a list of certified regional labs.
How hard is the tap water in 59625?+
Tap water in 59625 is classified as Very Hard with an estimated mineral hardness of 183 mg/L (10.7 GPG). A whole-home water softener system is strongly recommended to protect plumbing and home appliances.
Should I test private well water in 59625?+
Yes. Unlike municipal systems, private wells in 59625 are not regulated by the EPA or local utilities. Private well owners should test their water annually for coliform bacteria and nitrates, and every 3 to 5 years for heavy metals (lead, arsenic) and volatile organic compounds.
What is the lead level in 59625 tap water?+
The 90th percentile lead level in 59625 is 3.0 ppb. The EPA action level is 15 ppb. This is below the EPA action level.
Is there an active boil water notice in 59625?+
There are currently no active boil water advisories on record for 59625. Water treatment systems are operating within normal parameters.
Who provides tap water to 59625?+
Tap water in ZIP code 59625 is provided by Helena Water System (EPA ID: MT0000241), serving approximately 32,091 residents.
What water filter should I use in 59625?+
Based on water metrics for 59625, we recommend Reverse Osmosis (PFAS & Lead). Look for certifications such as NSF/ANSI 53 (Chemical Contaminants), NSF/ANSI 42 (Aesthetic Effects).

Data Sources & Methodology

Water quality data for ZIP code 59625 is compiled from the EPA Safe Drinking Water Information System (SDWIS), EPA ECHO enforcement database, UCMR5 unregulated contaminant monitoring, and Consumer Confidence Reports filed by Helena Water System. Safety scores are composite metrics derived from violation history, lead levels, enforcement actions, and infrastructure risk indicators. Data reflects a 5-year monitoring window. Last dataset update: 2024. View EPA source data →