BILLINGS, Montana Tap Water Quality

139,747 people served · 37 water systems

Failing

BILLINGS, Montana is a mid-sized community with 139,747 residents served by 37 distinct public water systems. Water service covers ZIP codes 59101, 59102, 59103, 59105, 59106.

BILLINGS has accumulated a significant number of EPA health-based violations. Reviewing the contaminants involved, requesting your utility's Consumer Confidence Report, and using certified point-of-use filtration is strongly advisable.

EPA reporting identifies Mercury (Inorganic) among the regulated contaminants associated with BILLINGS's recent health-based violations. Each contaminant has different sources, health implications, and recommended mitigation steps — links to the full EPA reference for each are listed alongside the violation history below.

Last updated: 2026-05-18 · Source: EPA SDWIS

Location

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Centered on ZIP-code centroids of water systems serving this city.

ZIP Codes Served

59101 59102 59103 59105 59106

Health-Based Violations (Last 5 Years)

EPA Maximum Contaminant Level exceedances reported by water systems serving BILLINGS. Each entry explains the contaminant, the health risk, and recommended precautions, and links to a full guide.

Mercury (Inorganic)chemical

EPA Code 1038 · Maximum Contaminant Level Exceedance

violations

EPA Limit

0.002 mg/L

Last Reading

11.3 MG/L

First Reported

Jan 2023

Most Recent

Jul 2025

What this violation means

Inorganic mercury in drinking water primarily damages kidneys. Most mercury exposure for Americans comes from fish (methylmercury), but localized water contamination occurs near refineries, coal-burning plants, and certain landfills.

Recommended precautions

→Reverse osmosis and distillation remove inorganic mercury.
→Activated carbon adsorption works for mercury but capacity is limited.
→Test private wells near industrial sites or landfills.

Read the complete guide to Mercury (Inorganic)

Source: EPA Safe Drinking Water Information System (SDWIS). Health-based violations only. Older violations may have been resolved; check your utility's most recent Consumer Confidence Report for current status.

Water Systems Serving BILLINGS

SPRUCE PARK MOBILE VILLAGE

PWSID: MT0000079

48 served

YELLOWSTONE BOYS AND GIRLS RANCH

PWSID: MT0000154

240 served

MOBILE CITY 3

PWSID: MT0005088

40 served

MOBILE CITY HOME PARK NO 2

PWSID: MT0003043

300 served

MOBILE CITY HOME PARK NO 1

PWSID: MT0000601

100 served

PIONEER WATER SERVICE

PWSID: MT0004226

900 served

FISHER WATER SERVICE

PWSID: MT0001848

750 served

PEKS MOBILE HOME COURT

PWSID: MT0004714

95 served

WESTANA MOBILE MANOR HAMILTON

PWSID: MT0000634

90 served

HIDDEN LAKE YELLOWSTONE COUNTY W AND S D

PWSID: MT0003374

350 served

BILLINGS HEIGHTS CO WATER DIST OF

PWSID: MT0000155

12,000 served

PRECISION WATER

PWSID: MT0004497

250 served

MOUNTAIN MEADOWS ESTATES LLP

PWSID: MT0001791

300 served

STONE CREEK SUBDIVISION

PWSID: MT0005183

378 served

SARTORIE LEGACY HOMES

PWSID: MT0005129

35 served

SKYCREST ESTATES SUBDIVISION

PWSID: MT0004964

235 served

BLACK ROCK ESTATES SUBDIVISION

PWSID: MT0004881

75 served

SHILOH ROAD DEVELOPMENT

PWSID: MT0005178

315 served

CRYSTAL SPRINGS WATER SYSTEM

PWSID: MT0003986

225 served

23 violations

GRANITE PARK WATER ASSOCIATION

PWSID: MT0004563

250 served

4 violations

SUNDANCE SUBDIVISION

PWSID: MT0005056

378 served

WELLS GARDEN ESTATES

PWSID: MT0002927

240 served

OAK RIDGE ESTATES

PWSID: MT0004250

200 served

DOUBLE DIAMOND SUBDIVISION ARBOR HILLS

PWSID: MT0004845

50 served

C & C COMMUNITY INC

PWSID: MT0005017

145 served

LOCKWOOD WATER AND SEWER DISTRICT

PWSID: MT0000156

5,900 served

ERICS EMERGENCY WATER SERVICE

PWSID: MT0006002

100 served

ALDINGER ACRES SUBDIVISION

PWSID: MT0003552

100 served

BLUE GRASS WATER USERS ASSOCIATION

PWSID: MT0004093

60 served

BILLINGS CITY OF

PWSID: MT0000153

114,000 served

GOLDEN EAGLE WATER USERS ASSN

PWSID: MT0002840

125 served

MIDWAY TOWNHOMES WUA

PWSID: MT0005065

75 served

CHERRY CREEK ESTATES LLC

PWSID: MT0004392

600 served

EMERALD VIEW PARK

PWSID: MT0002996

320 served

STILL RIVER ESTATES SUBDIVISION

PWSID: MT0005118

188 served

4 violations

DUCK CREEK MOBILE HOME PARK

PWSID: MT0001786

70 served

13 violations

THE NINES SUBDIVISION

PWSID: MT0004989

220 served

What Can You Do?

✅ Request your utility's annual Consumer Confidence Report (CCR) — required by law.
✅ Use an NSF-certified water filter if violations involve lead, arsenic, or PFAS.
✅ Run cold water for 30 seconds before drinking if you have older plumbing (reduces lead).
✅ Check back monthly — we update data from the EPA every 30 days.

About this data

This overview reflects EPA SDWIS data published as of 2026-05-18. It covers active Community Water Systems (CWS) that exceeded federal Maximum Contaminant Levels during the past five-year EPA reporting window. For up-to-the-minute information, request a current Consumer Confidence Report from your utility, or review the EPA's public dashboard.

Frequently Asked Questions

Is BILLINGS, Montana tap water safe to drink?▼

This city's water had numerous EPA violations in the last 5 years. Consider filtered water.

How many EPA violations does BILLINGS have?▼

BILLINGS has 44 EPA health-based water violations in the last 5 years across 37 water systems serving 139,747 people.

What contaminants have been found in BILLINGS water?▼

The following EPA-regulated contaminants have been detected: 1038. View details about each contaminant, health effects, and recommended precautions above in the violations table.

Should I use a water filter in BILLINGS?▼

Using an NSF-certified water filter is recommended if your area has violations involving lead, arsenic, or PFAS. For other contaminants, consult your local water utility. Check the annual Consumer Confidence Report (CCR) for detailed guidance.

What should I do if there are violations in BILLINGS?▼

Request your water utility's annual Consumer Confidence Report (CCR), which is required by the EPA. Follow the utility's guidance on boil water advisories. Run cold water for 30 seconds before drinking if you have older plumbing. Use an NSF-certified filter if needed based on your water system's violations.