How many water violations are in Clackamas County?

Clackamas County has 18,114 total drinking water violations across 231 water systems, of which 1,923 are health-based violations. 97.4% of systems have at least one violation.

How many people get water from Clackamas County systems?

Water systems in Clackamas County serve approximately 385,530 people through 231 public water systems.

Has PFAS been detected in Clackamas County water?

Under EPA UCMR5, 4 of 15 tested systems in Clackamas County had at least one PFAS detection (26.7% of the UCMR5-tested subset - not of all 231 SDWIS systems).

What types of water sources supply Clackamas County?

Water systems in Clackamas County use GW (206 systems), SW (25 systems) as their primary water sources.

Are health-based violations serious?

Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 10.6% of Clackamas County's violations are health-based. Among counties with any SDWIS violations, this extract puts Clackamas County in the middle health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

Where does Clackamas County sit among U.S. counties for water-system population?

According to EPA SDWIS county population served used on /counties, Clackamas County ranks #187 of 3,254 counties by people served, and #3 of 36 counties in Oregon. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Oregon

Clackamas County, Oregon

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet OR005 · Clackamas County 231 sys · 18,114 viol · #187/3254

VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-MID · SRC-GW · SYS-LARGE · BOOK-FULL

VIOL-SEVERE 97.4% flagged
HEALTH-LOW 10.6% health
RANK-TOP #187/3254
PHOTO-FINISH ±0.3 pp
PFAS-MID 26.7% detect
SRC-GW GW lead 89%
SYS-LARGE 231 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Deschutes County ( -0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Clackamas County ranks #187 of 3,254 counties by people served, and #3 of 36 counties in Oregon. See methodology · corpus placement.

Clackamas County standing, mid-flagged corpus third

Flagged-system rate 97.4% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 10.6% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 26.7% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #187 of 3,254 · #3 of 36 in Oregon.

Water Systems

System Name	Population	Violations	PFAS
Sunrise Water Authority	50,003	7	Detected
Lake Oswego Municipal Water	40,000	39	Clean
Oregon City	33,940	0	Clean
Oak Lodge Water Services	30,000	2	Clean
Clackamas River Water	29,918	85	Clean
West Linn, City Of	28,000	4	Clean
Wilsonville, City Of	25,915	44	Clean
Milwaukie, City Of	20,946	265	Detected
Clackamas River Water - Clairmont	19,928	23	Clean
Canby Utility	18,754	57	Clean
Sandy, City Of	12,991	347	Clean
Gladstone, City Of	12,121	63	Clean
Molalla, City Of	10,298	38	Detected
Estacada, City Of	5,750	291	Detected
Rivergrove Water District	4,000	64	Clean
Lake Grove Water District	3,100	42	-
Boring Water District No 24	2,500	237	-
Colton Water District	1,500	474	-
Salmon Valley Water Company	1,500	34	-
Usfs Timberline Lodge 1	1,500	353	-
Athey Creek Church	1,000	3	-
Rhododendron Wtr Assoc	980	361	-
Southwood Park Water District	900	22	-
Oprd Milo McIver State Park	850	34	-
Timberline Rim Water Co Inc	800	45	-
Mulino Water District	700	40	-
Riverbend Mobile Home Park	600	168	-
Stafford Elementary	600	83	-
Barton Food Mart	570	17	-
Big Valley Woods Water Corp	550	142	-
Usfs Trillium Lake Cg	500	18	-
Usfs Hoodview Pine Pt	500	6	-
Meadowbrook Grocery	500	46	-
Space Age Sandy	500	0	-
Ninety-One Elem SD 91	450	220	-
Oregon Trail SD - Kelso Elem	450	29	-
Carus Elementary	415	93	-
Pioneer Mobile Home Park	400	120	-
Riverview Mfgd Home Court	400	131	-
Clackamas Co Pks-Metzler Pk #1	400	44	-
Oregon Trail SD - Boring Mid Sch	400	177	-
Clackamas Co Pks-Metzler Pk #2	400	24	-
Country Christian School	400	42	-
Butte Creek Elementary SD 67J	326	23	-
Kelso Water Assn	300	60	-
Glenmorrie Cooperative Assn	300	20	-
Alder Creek Barlow Water Dist	300	83	-
Eagle Crest Mobile Home Park	300	41	-
Clackamas Co Pks-Barton Park	300	40	-
Oregon Trail SD - Cottrell Elem	300	51	-

Compare beyond Oregon

Mid-flagged peers for Clackamas County

Cross-state counties nearest Clackamas County on flagged-system share (97.4%) and cumulative violation count (18,114). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Compiled by PlainWater, Drinking Water Quality Editorial Process · May 15, 2026

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.