Lead In Drinking Water In Montana
What residents of Montana need to know about lead in drinking water — including how it enters water, which utilities have documented violations, and what steps to take.
Source: EPA SDWIS, Montana Department of Environmental Quality (MDEQ), CDC · Last reviewed: 2025-01-01
Quick Answer
Is lead in drinking water a real concern in Montana?
Yes — Montana's older mining towns (Butte, Anaconda, Helena) have aging water infrastructure and a broader context of heavy metal awareness from historic mining activity. Billings, Great Falls, and Missoula have older housing stock in their city cores.
Is this mostly a public-water issue, a private-well issue, or both?
Primarily household plumbing and service connections in pre-1986 housing in older Montana cities; rural small systems have limited compliance capacity.
What is the main reason residents should care?
Montana's mining heritage cities — particularly Butte and Anaconda — operate in a context of broader environmental awareness around heavy metals from historic copper and silver mining. Their older water infrastructure and pre-1940 housing make lead plumbing a relevant concern independent of the mining legacy.
Key Facts
| Federal Lead Action Level | 15 µg/L — no safe level per CDC |
| Mining city context | Butte, Anaconda, and Helena have pre-1940 housing with aging water infrastructure |
| Small system challenge | Many small rural Montana systems have limited LCRR compliance resources |
| Broader metal awareness | Mining legacy communities have heightened awareness of environmental heavy metal exposure |
| State oversight | Montana Department of Environmental Quality (MDEQ) |
Why This Matters in Montana
Montana's older industrial cities have water infrastructure built during the mining and railroad eras of the late 19th and early 20th centuries. Butte's older residential areas, Anaconda's historic core, Helena's neighborhoods near the state capitol, and Billings's downtown district all have concentrations of pre-1940 housing with lead service lines and lead solder. Montana also has many very small water systems in rural communities with limited technical and financial resources for Lead and Copper Rule compliance. The Bunker Hill and Anaconda Copper Company Superfund sites — related to mining activity, not drinking water plumbing — provide a broader context for environmental awareness in these communities. MDEQ enforces the Lead and Copper Rule and requires utilities to complete service line inventories.
Montana Utilities With Lead Violation Records
The utilities listed below have at least one lead violation on record in EPA's SDWIS database. Violations may be open or resolved — see individual utility pages for current status and risk level.
How Lead Gets Into Drinking Water
Lead service lines
The pipe connecting a home to the water main may be made of lead, especially in pre-1986 construction. Water sitting in these lines can accumulate lead before it reaches the tap.
Lead solder
Lead solder at pipe joints was banned for potable water systems in 1986. Homes built before that date — including significant portions of older Montana cities — may still have lead solder throughout their plumbing.
Older brass fixtures
Faucets, valves, and fixtures with high lead content were common before the 2014 revision of 'lead-free' standards. Replacing older fixtures at kitchen and drinking taps can meaningfully reduce exposure.
Corrosive water chemistry
Soft, acidic, or low-alkalinity water dissolves lead from plumbing more readily. Utilities use orthophosphate and other corrosion control treatments, but household plumbing after the meter is not within their control.
Who Should Pay Closest Attention
Families with young children in older Butte, Anaconda, Helena, and Billings neighborhoods should request service line information from their utility and consider certified filtration. Rural Montana residents served by very small water systems should review their utility's compliance history on this site.
Families with children under six
Pregnant residents
Households in homes built before 1986
Renters who cannot inspect building plumbing
Residents on a confirmed lead service line
Households that had plumbing work done recently (disturbances dislodge protective scale)
How to Check Your Situation in Montana
- 1
Identify your water utility. Use the ZIP lookup below or browse the Montana utility directory on this site.
- 2
Read your utility's page on this site to see its current risk level and any open lead violations.
- 3
Contact your utility and ask for your address-level service line material status. Under the federal Lead and Copper Rule Revisions (LCRR), utilities must maintain and provide this information.
- 4
Review your utility's most recent Consumer Confidence Report (CCR) — mailed annually or available on the utility's website.
- 5
Consider testing your tap water at a Montana Department of Environmental Quality (MDEQ)-certified lab. Your state health department or Montana Department of Environmental Quality (MDEQ) maintains a list of certified labs.
- 6
If you have young children or are pregnant, install a certified NSF/ANSI 53 or 58 filter at the kitchen tap as a precautionary measure.
Treatment Options
Boiling does not remove lead. Use a certified filter for drinking and cooking water.
NSF/ANSI Standard 53 — Activated Carbon Block
Under-sink or pitcher filters certified to Standard 53 are independently verified to reduce lead. Replace filters on the manufacturer's schedule — an overdue filter may not perform as certified.
NSF/ANSI Standard 58 — Reverse Osmosis
RO systems certified to Standard 58 remove 95–99% of lead and a broad range of contaminants. Requires under-sink installation. More comprehensive than Standard 53 for households with multiple contaminant concerns.
Flushing — temporary mitigation only
EPA recommends flushing the cold tap for 30 seconds to 2 minutes if water has sat in pipes for 6+ hours. Not a substitute for certified filtration or service line replacement.
Frequently Asked Questions
Related Pages
Lead — National Overview
All U.S. utilities with lead records
Montana State Overview
All utilities and water quality data
Nitrate in Drinking Water
A separate but common concern
Reverse Osmosis Guide
Removes 95–99% of lead
Activated Carbon Filter Guide
NSF/ANSI 53 certified options
All Contaminants
Complete reference library
Data Sources & Provenance
All data on this page is sourced from official U.S. government or public datasets.
Find Your Utility
State Regulator
Montana Department of Environmental Quality (MDEQ) ↗