Apr 15, 2026 · 7 min read
PFAS "Forever Chemicals" in US Drinking Water: 2026 Update
PFAS contamination affects an estimated 200 million Americans. Here's what the latest EPA enforcement means for your tap water.
Public Water System
HIGHLINE WATER DISTRICT
PWSID WA5340650 · Washington · 100,170 people served
A
ExcellentHIGHLINE WATER DISTRICT is an EPA-regulated public water system in Washington (PWSID WA5340650). It serves an estimated 100,170 residents — a mid-sized community of customers — across 1 community across 1 ZIP code.
HIGHLINE WATER DISTRICT has maintained full EPA Safe Drinking Water Act compliance over the most recent five-year reporting window. No health-based Maximum Contaminant Level (MCL) exceedances are on record. The grade of A reflects this clean compliance history.
Service Area
Loading map...
Centered on the averaged ZIP-code centroid of 1 ZIP served.
Population
100,170
Cities
1
ZIPs
1
Violations
0
EPA Health-Based Violations
Health-based Maximum Contaminant Level (MCL) violations on file for HIGHLINE WATER DISTRICT over the past five years of EPA SDWIS reporting.
✅
No health-based violations in the last 5 years.
HIGHLINE WATER DISTRICT's water systems have met EPA health-based Maximum Contaminant Level (MCL) requirements throughout the EPA reporting window. This does not mean zero detection of regulated contaminants — it means all measured concentrations remained below their federal action levels.
Cities Served by HIGHLINE WATER DISTRICT
ZIP Codes Served
About this system
EPA records this system as PWSID WA5340650. Data reflects the most recent EPA SDWIS publication as of 2026-05-18. Public Water System Identifiers (PWSIDs) are assigned by the EPA's Safe Drinking Water Act program to track every regulated water utility in the United States. The first two letters typically indicate the state primacy agency. For real-time water quality information, contact HIGHLINE WATER DISTRICT directly or review their annual Consumer Confidence Report (CCR).
From the Blog
Photo by Bluewater Sweden on Unsplash
Mar 22, 2026 · 6 min read
How to Read Your Annual Water Quality Report (CCR)
Your water utility is legally required to send you a Consumer Confidence Report every year. Here's how to actually understand it.
Photo by Louis Hansel on Unsplash
Mar 5, 2026 · 9 min read
Lead in Tap Water: The Complete 2026 Guide
Lead enters drinking water through old pipes and fixtures. Here's how to identify your risk and what to do about it.
Photo by Eduardo Casajús Gorostiaga on Unsplash
Feb 18, 2026 · 5 min read
What Is an EPA Maximum Contaminant Level (MCL)?
MCLs are the foundation of US drinking water safety. Here's how they're set and what they mean for your tap.
Photo by Naja Bertolt Jensen on Unsplash
