How many water violations are in Benton County?

Benton County has 3,039 total drinking water violations across 48 water systems, of which 499 are health-based violations. 100.0% of systems have at least one violation.

How many people get water from Benton County systems?

Water systems in Benton County serve approximately 72,210 people through 48 public water systems.

Has PFAS been detected in Benton County water?

Under EPA UCMR5, 0 of 3 tested systems in Benton County had at least one PFAS detection (0.0% of the UCMR5-tested subset - not of all 48 SDWIS systems).

What types of water sources supply Benton County?

Water systems in Benton County use GW (44 systems), SW (4 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. 16.4% of Benton County's violations are health-based. Among counties with any SDWIS violations, this extract puts Benton County in the middle health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

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

According to EPA SDWIS county population served used on /counties, Benton County ranks #721 of 3,254 counties by people served, and #11 of 36 counties in Oregon. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Oregon

Benton County, Oregon

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet OR003 · Benton County 48 sys · 3,039 viol · #721/3254

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

VIOL-SEVERE 100.0% flagged
HEALTH-LOW 16.4% health
RANK-UPPER #721/3254
PHOTO-FINISH ±0.0 pp
PFAS-CLEAN 0.0% detect
SRC-GW GW lead 92%
SYS-MID 48 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Multnomah County (+ 0 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Benton County ranks #721 of 3,254 counties by people served, and #11 of 36 counties in Oregon. See methodology · corpus placement.

Benton County standing, mid-flagged corpus third

Flagged-system rate 100.0% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 16.4% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #721 of 3,254 · #11 of 36 in Oregon.

Water Systems

System Name	Population	Violations	PFAS
Corvallis, City Of	61,468	39	Clean
Philomath Public Works	4,670	118	Clean
Adair Village Water System	875	230	Clean
Monroe, City Of	723	245	-
Knoll Terrace Park	452	94	-
Vineyard Mountain Water	325	24	-
Mt View Elementary SD 509J	250	60	-
Kings Valley Charter School	215	106	-
Blodgett Country Store	210	27	-
Alsea County Service District	202	40	-
Childrens Farm Home Campus	200	84	-
Stahlbush Island Farms	200	191	-
Corvallis Waldorf Association	180	41	-
Calvary Corvallis	173	59	-
Fir View Water Company	150	189	-
Muddy Creek Charter School	125	22	-
Blm Alsea Falls Camping	120	22	-
Cascade View Estates	113	94	-
North Corvallis MHP-Well #1	100	71	-
Pub, The	100	14	-
Suburban Christian Church	100	86	-
City Limits	100	20	-
Ridgewood Dist Improv Co	90	48	-
Garland Nursery	90	24	-
Pioneer Village Water Company	80	42	-
Consumers Power Inc	60	33	-
Philomath Scout Lodge	60	1	-
Beazell Memorial Forest	54	7	-
Student Transportation of America	53	51	-
Hull-Oakes Lumber Company	51	28	-
Raintree Estates	50	108	-
Little Beavers Preschool #1	50	42	-
Gathering Together Farms	50	11	-
Benton Co Pks Salmonberry Cg	43	34	-
Jackson Creek Water Association	39	50	-
Tennis West Racquet Club	39	40	-
Blodgett Elementary SD 17J	35	22	-
Kammerer Industrial Park WS	32	70	-
Bellfountain Community Church	32	247	-
Patrick Lumber Company	32	1	-
Alpine Tavern	30	84	-
Life Community Church	30	23	-
Hpaulson Livestock and Feed	30	20	-
Camp Alpine Church of Lds	28	30	-
Benton Co Pks Bellfountain Pk	26	19	-
Tunnel Radio of America	25	1	-
Fort Hoskins Park	25	123	-
G3 Sports and Fitness	25	4	-

Compare beyond Oregon

Mid-flagged peers for Benton County

Cross-state counties nearest Benton County on flagged-system share (100.0%) and cumulative violation count (3,039). 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.