Tapcensus

Oregon

Columbia County drinking water quality

59 active public water systems serve 40,230 people in Columbia County. 6 are compliant, 53 had at least one EPA violation in the past three years, 2 are designated serious violators, and 2 carry a health flag.

Active systems 59 38 community systems
People served 40K by public water systems
Systems with violations 53 90% of active systems, past 3 years
Serious violators 2 2 systems carry a health flag

Needs attention

Deer Island Waterworks OR4101233 · Community water system · Serves 90 5 rules violated in the past three years. Unresolved: Ground Water Rule, Lead and Copper Rule, Public Notice Rule and Revised PN Rule, and Consumer Confidence Rule.
McCuddys Landing OR4106090 · Community water system · Serves 70 4 rules violated in the past three years. Unresolved: Lead and Copper Rule and Consumer Confidence Rule.
Deer Island Village MHP OR4100982 · Community water system · Serves 50 3 rules violated in the past three years. Unresolved: Ground Water Rule, Public Notice Rule and Revised PN Rule, and Consumer Confidence Rule.
Berndt Creek Water Corp OR4105737 · Community water system · Serves 45 2 rules violated in the past three years. Unresolved: Stage 1 Disinfectants and Disinfection Byproducts Rule.

Community water systems

38 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
ST Helens, City of
 13,410 3 0
Scappoose, City of
 8,710 3 0
McNulty Water Pud
 2,500 2 0
Vernonia, City of
 2,100 6 1
Clatskanie, City of
 2,096 5 0
Warren Water Association
 2,050 1 0
Columbia City Mun Waterworks
 1,995 2 0
City of Rainier
 1,932 8 0
Western Hills MH Estates
 375 5 3
Fishhawk Lake Reserve and Community
 350 6 1
Quincy Water Association
 300 0 0
Midland Water Association
 160 8 1
Columbia Acres Water Assoc
 110 4 1
Lost Creek Heights Wtr Assoc
 100 3 1
Country Villa Mobile Estates
 90 3 2
Deer Island Waterworks
 90 5 4
Deer View Cooperative
 90 6 1
Paradise Moorage
 90 4 1
Goble Water Association
 85 3 0
Columbia Hills HOA
 84 4 0
Tamarack Mobile Home Park
 80 4 1
Laurel Ridge MHP
 70 3 0
Marshland Water Association
 70 5 1
McCuddys Landing
 70 4 2
Prescott, City of
 70 6 1
Maple Terrace Mobile Home Park
 65 4 1
Deer Island Heights WS
 60 6 2
Cedar Tree Mobile Home Park
 50 3 0
Deer Island Village MHP
 50 3 3
Deer Island Village Mhp-Fawn Lane
 50 2 0
Laurelwood Water Assoc
 50 1 0
Berndt Creek Water Corp
 45 2 1
Dikeside Moorage
 45 0 0
J & M Mobile Home Park
 45 5 2
Hogg Heaven MHP
 40 7 4
Swedetown Water Assoc
 40 4 3
Mountain View Motel
 36 0 0
Westland Water Association
 25 1 1
Non-community systems (21: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Rainier SD #13
 950 3 0
Columbia CO Pks-Camp Wilkerson
 200 0 0
Columbia CO Pks-Hudson/parcher
 200 2 1
Rainier or Lds Church
 150 1 0
Columbia CO Pks-Big Eddy
 125 0 0
Alston Corners-Assembly of God
 100 0 0
Scappoose Brew & Thru
 100 2 0
Shell Star Mart
 100 3 0
Alston Country Store
 90 3 1
Rainier Congregation of JW
 90 1 0
Olympic Forest Products
 80 2 2
Columbia River Nitrogen, LLC
 65 1 0
Valley of the Moon
 46 1 0
Columbia River Pud
 45 1 0
Island Community LLC
 41 2 0
Mist Grade Elem SD 47j
 40 1 0
Pge Beaver Generating Station
 30 5 0
Alston Pub & Grub
 25 2 1
Columbia CO Pks-Scaponia
 25 1 1
Michael Curry Design
 25 4 0
Pge Trojan Park
 25 1 0
Inactive systems (183, no longer operating or reporting)

Kept for the record and excluded from the county totals above. Browse inactive systems.

About this data

Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.

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 Oregon 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. Retrieved from ECHO on Oct 11, 2026.