Tapcensus

Total Haloacetic Acids (HAA5) violations in Washington

200 active public water systems in Washington had a Total Haloacetic Acids (HAA5) violation in the past three years, 13 of them in the latest quarter of EPA's data. What Total Haloacetic Acids (HAA5) is and why it matters.

Health effects: Dichloroacetic acid is a probable human carcinogen (Group B2). Long-term exposure to trichloroacetic acid may also increase cancer risk. Animal studies show liver, kidney, and reproductive effects at high doses.

Systems with a Total Haloacetic Acids (HAA5) violation

Latest quarter first, then largest first
SystemServesStatusRules violated, 3 yrUnresolved
Scenic Heights W a INC
Island County 		78 2 0
Vel View Water Dist 13
Spokane County 		77 3 0
Eastgate
Island County 		76 2 0
Peoples Creek Water System
Snohomish County 		76 1 0
Goosehaven
Pend Oreille County 		75 1 0
Island Ptba Water System
Island County 		75 1 0
Lake Wilderness Shore Acres Estate
King County 		75 5 0
Silver Lake RD Acreage Tracts
Island County 		73 1 0
Mabana Shores Association
Island County 		68 3 0
Eagle Cove Water Association
San Juan County 		65 1 0
Fir Grove Mobile Park
Island County 		65 2 0
Polnell Heights Water Association
Island County 		65 3 1
Whitstran Heights Water Association
Benton County 		65 2 0
Crescent Acres Water Association
Island County 		64 2 0
Cattle Point Water District
San Juan County 		63 2 0
Campbells Glen
Island County 		62 6 1
Whidbey Highlands Water Assoc
Island County 		62 2 0
National Food NW Lind
Adams County 		61 3 0
Silver Springs Estates Comm Assn
Snohomish County 		61 1 0
Suburban Mobile Park
Island County 		60 2 0
Fall City Water Dist. (plum Creek)
King County 		59 3 0
Orcas Island Golf Estates
San Juan County 		57 3 0
Pleasant View Water Company
Island County 		57 1 0
Sleeper Acres Comm. Assoc. Inc.
Island County 		56 3 0
Mutual Materials Company
Spokane County 		55 5 0
Diablo Wtr Sys-Seattle City Light
Whatcom County 		53 3 0
Syringa Heights Mobile Home Park
Spokane County 		52 4 1
Alpine Acres Community Association
Chelan County 		51 6 0
Bonnie View Water
Island County 		50 2 0
Lyon RD Community Association
Island County 		50 1 0
Taylor Road Water System
Island County 		50 1 0
Riverside Water Dist #1
Snohomish County 		48 3 0
Damman School
Kittitas County 		45 5 1
Williams Lake Beach Club
Spokane County 		45 2 0
Hannah Heights #2 Water Users Assn
San Juan County 		44 2 0
Township 29 Water Association
Island County 		42 2 0
Polnell Landing Water Assoc.
Island County 		41 4 0
Smwe Vineyard 8
Benton County 		41 1 0
Seawest Water System
Island County 		38 2 0
Leisure Acres Water Association
Island County 		35 3 0
Meadowbrook Homeowners Assn
Snohomish County 		35 1 0
Bayview Meadows Water System
Island County 		34 2 0
Reservoir Hill Maintenance Assn
Kittitas County 		34 3 0
Sunrise Point Water CO
Island County 		32 1 0
Stillaguamish Natural Resources
Arlington · County 		31 3 1
North Forty Property Owners Assn
San Juan County 		27 1 0
Cascade View Road Water System
Island County 		26 2 0
Ocosta Mobile Home Park LLC
Grays Harbor County 		26 4 1
Red Gate Mobile Home Park
Pierce County 		25 5 0
Woods Creek Water District
Snohomish County 		25 1 0
About this data

A system is counted once if any of its violations in the past three years involved Total Haloacetic Acids (HAA5), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Total Haloacetic Acids (HAA5) alone.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Washington records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.