Lead In Drinking Water In Washington
What residents of Washington 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, Washington State Department of Health (WSDOH), CDC · Last reviewed: 2025-01-01
Quick Answer
Is lead in drinking water a real concern in Washington?
Yes — Washington's soft, naturally corrosive water chemistry in the Puget Sound region is a recognized factor in lead leaching from older plumbing.
Is this mostly a public-water issue, a private-well issue, or both?
Primarily older household plumbing; Washington's soft, low-mineral water is more aggressive toward lead-bearing materials than harder water supplies.
What is the main reason residents should care?
Washington State's naturally soft, low-alkalinity water (especially in western Washington and the Puget Sound region) is more corrosive than hard water. This chemistry accelerates lead leaching from lead solder, brass fixtures, and older service connections.
Key Facts
| Federal Lead Action Level | 15 µg/L — zero is the CDC-recognized safe threshold |
| Washington water chemistry | Naturally soft, low-alkalinity water in western WA is more corrosive toward lead |
| Federal MCLG | Zero |
| State requirement | Utilities must inventory and plan for lead service line replacement |
| State oversight | Washington State Department of Health (WSDOH) |
Why This Matters in Washington
Western Washington's water sources — snowmelt and rainfall — produce naturally soft, low-mineral water that lacks the buffering capacity of harder groundwater supplies. This corrosive chemistry can dissolve lead from older service lines, lead solder, and brass fixtures, even after effective treatment at the plant. Seattle Public Utilities and Tacoma Public Utilities have been proactive in lead service line replacement and corrosion control. Washington State enacted requirements for utilities to inventory and plan for replacement of lead service lines, and WSDOH provides public guidance on testing and filtration.
Washington 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.
Clark Public Utilities
Washington · 153,526 served
Pasco Water Department
Washington · 115,102 served
City of Richland
Washington · 106,499 served
Southwood
Washington · 64,155 served
Jblm Lewis
Washington · 62,197 served
City of Pullman Water Department
Washington · 31,315 served
City of Battle Ground Water Dept
Washington · 30,237 served
Vera Water & Power
Washington · 24,692 served
City of Aberdeen
Washington · 22,867 served
Pud #1 of Asotin County
Washington · 21,930 served
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 Washington 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
Residents in Seattle, Tacoma, and Spokane neighborhoods with pre-1986 housing are most at risk. Washington's corrosive water chemistry makes even moderate amounts of lead-bearing plumbing a concern compared to harder-water states.
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 Washington
- 1
Identify your water utility. Use the ZIP lookup below or browse the Washington 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 Washington State Department of Health (WSDOH)-certified lab. Your state health department or Washington State Department of Health (WSDOH) 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
Washington 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.
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