750 water systems in Oregon have at least one health-based violation on record. The system with the most health-based violations is Weiss Estates Water System in Bandon with 134 health-based violations. Health-based violations mean a system exceeded an EPA maximum contaminant level or failed required treatment standards.
| Water System | City | Population | Health Violations | Total Violations |
|---|
| Weiss Estates Water System |
Bandon | 36 |
134 | 214 |
| London Water Co-Op |
Cottage Grove | 63 |
126 | 473 |
| Manzanita Hills Subdivision |
Shady Cove | 30 |
110 | 162 |
| City of Monroe |
Harrisburg | 723 |
101 | 257 |
| Skyview Acres Water Company |
Sandy | 200 |
94 | 133 |
| City of Vale |
Vale | 1,837 |
82 | 174 |
| Galice Subdivision Water Co |
Merlin | 33 |
79 | 2,676 |
| Swisshome Village |
Cottage Grove | 24 |
52 | 704 |
| Cascade Gorge Properties |
Cave Junction | 33 |
51 | 600 |
| City of Sandy |
Sandy | 12,991 |
44 | 114 |
| Warm Springs Water Treatment Plant |
Warm Springs | 3,800 |
43 | 437 |
| Saginaw Park Water System |
Eugene | 60 |
43 | 159 |
| City of Adrian |
Adrian | 159 |
42 | 546 |
| Dexter Oaks Co-Op |
Dexter | 75 |
36 | 51 |
| Minikahda Water System |
Welches | 22 |
35 | 45 |
| Lawson Acres Water Association |
Riddle | 75 |
32 | 213 |
| Simnasho Schoolie |
Warm Springs | 350 |
32 | 89 |
| Dollar General 15597 |
Fairview | 25 |
29 | 38 |
| Cswa Chehalem Springs |
Newberg | 130 |
28 | 116 |
| Garden Valley Water Association |
Coquille | 84 |
27 | 98 |
| Siskiyou Field Institute |
Selma | 25 |
27 | 62 |
| City of Nyssa |
Nyssa | 3,285 |
27 | 53 |
| Milo Academy |
Days Creek | 124 |
26 | 271 |
| Maple Elsie Water Service |
Seaside | 100 |
25 | 302 |
| Osu Rowing Center |
Corvallis | 90 |
22 | 79 |
| Callahans Mountain Lodge |
Ashland | 60 |
21 | 102 |
| City of Richland |
Richland | 165 |
21 | 65 |
| Whaleshead Beach Resort, LLC |
Brookings | 108 |
20 | 157 |
| City of Canyonville |
Canyonville | 1,662 |
20 | 127 |
| Dunn Court Duplexes |
Aloha | 88 |
20 | 116 |
| Arrah Wanna Water Company |
Welches | 40 |
20 | 28 |
| Midland Water Association |
Clatskanie | 160 |
19 | 449 |
| Nps Oregon Caves Natl Mon |
Cave Junction | 280 |
18 | 100 |
| Scofield Mobile Home Court |
Newport | 39 |
18 | 75 |
| Paradise/Rogue Meadows Ws |
Clackamas | 165 |
18 | 66 |
| Tooley Water District |
Newberg | 97 |
18 | 63 |
| Young Life |
Antelope | 497 |
18 | 42 |
| Camp Yamhill |
Yamhill | 250 |
18 | 42 |
| Camp Myrtlewood |
Myrtle Point | 75 |
17 | 135 |
| Umpqua Ranch Coop |
Idleyld | 161 |
17 | 119 |
| Camp Tilikum |
Newberg | 75 |
17 | 57 |
| Georgia-Pacific, Wauna Mill |
Clatskanie | 760 |
17 | 23 |
| Sunny Wolf Charter Preschool |
Wolf Creek | 26 |
16 | 85 |
| Douglas Co Pks Whistlers Bend |
Roseburg | 100 |
15 | 361 |
| Smith River Marina |
Reedsport | 30 |
15 | 157 |
| Nestucca Valley Elementary School |
Newberg | 325 |
15 | 96 |
| Marshland Water Association |
Clatskanie | 70 |
14 | 108 |
| Harper High/Elementary Sd 66 |
Harper | 117 |
14 | 38 |
| Shady Oaks Estates |
Portland | 648 |
14 | 30 |
| Watseco-Barview Water District |
Garibaldi | 450 |
14 | 30 |
| Colton Water District |
Colton | 1,500 |
13 | 242 |
| City of Drain |
Drain | 1,194 |
13 | 108 |
| Drift Creek Landing |
Waldport | 34 |
13 | 74 |
| Montgomery Place Water System |
Portland | 207 |
13 | 72 |
| City of Reedsport |
Reedsport | 4,836 |
13 | 55 |
| Annex Charter School |
Ontario | 50 |
13 | 47 |
| Enchanted Mobile Home Park |
Portland | 150 |
12 | 77 |
| Big Spruce MHP LLC |
Eugene | 80 |
12 | 63 |
| Western Hills Mh Estates |
Rainier | 375 |
12 | 34 |
| Interlachen Water Pud |
Fairview | 360 |
12 | 32 |
| Applewood Mobile Home Park |
Eugene | 125 |
12 | 26 |
| Mapleton Water District |
Mapleton | 600 |
11 | 227 |
| Youngs River Lewis & Clark Wd |
Astoria | 2,580 |
11 | 110 |
| City of Paisley |
Paisley | 245 |
11 | 35 |
| Lakeside Mobile Home Park |
Eugene | 28 |
11 | 29 |
| Inn at Otter Crest |
Otter Rock | 90 |
11 | 18 |
| Wells Creek RV Resort |
Scottsburg | 25 |
10 | 230 |
| USFS Timberline Lodge 1 |
Molalla | 1,500 |
10 | 169 |
| Deer Island Waterworks |
St Helens | 90 |
10 | 154 |
| Coe Lookout Pt-Ph/Dexter |
Eugene | 43 |
10 | 144 |
| Little River Christian Camp |
Dorena | 30 |
10 | 111 |
| Fischers Place MHP |
Scappoose | 130 |
10 | 75 |
| Country Club Estates Wd |
Coos Bay | 45 |
10 | 73 |
| Pinewood Mobile Manor |
The Dalles | 130 |
10 | 59 |
| Hanley Farm Living History Museum |
Medford | 25 |
10 | 53 |
| Alderwood Water Dev Co |
Eugene | 34 |
10 | 52 |
| USFS Big Lake Campground |
Albany | 150 |
10 | 49 |
| Oceanside Water District |
Oceanside | 500 |
10 | 39 |
| City of Gladstone |
Gladstone | 12,121 |
10 | 31 |
| Sumner Water Corporation |
Coos Bay | 50 |
9 | 1,112 |
| Cold Springs Water Co |
Gaston | 100 |
9 | 321 |
| Hat Rock Water Company |
Hermiston | 108 |
9 | 207 |
| Dixie Elementary Sd 509j |
Corvallis | 110 |
9 | 189 |
| City of Lafayette |
Lafayette | 4,423 |
9 | 159 |
| Alder Creek Barlow Water Dist |
Sandy | 300 |
9 | 130 |
| Willowcreek Elem Sd #84 |
Vale | 80 |
9 | 40 |
| Oprd Jm Honeyman Memorial Park |
Florence | 350 |
9 | 22 |
| Corvallis Waldorf Association |
Corvallis | 180 |
9 | 22 |
| Rhododendron Wtr Assoc |
Rhododendron | 980 |
9 | 19 |
| Burns Paiute |
Burns | 155 |
8 | 408 |
| City of Sumpter |
Sumpter | 208 |
8 | 207 |
| Highline Oaks Water Utility |
Portland | 242 |
8 | 195 |
| Sidwalter |
Warm Springs | 130 |
8 | 178 |
| Morrisons Rogue River Lodge |
Merlin | 50 |
8 | 139 |
| Bia Celilo Village |
Warm Springs | 75 |
8 | 99 |
| Row River Valley Water Dist |
Dorena | 340 |
8 | 94 |
| Alsea River RV Park |
Waldport | 24 |
8 | 88 |
| City of Monument |
Monument | 115 |
8 | 75 |
| Langlois Water District |
Langlois | 220 |
8 | 52 |
| Everett Square Windcrest Estates |
Portland | 204 |
8 | 52 |