How many water violations are in Idaho County?

Idaho County has 3,546 total drinking water violations across 58 water systems, of which 1,480 are health-based violations. 96.6% of systems have at least one violation.

How many people get water from Idaho County systems?

Water systems in Idaho County serve approximately 10,236 people through 58 public water systems.

Has PFAS been detected in Idaho County water?

Under EPA UCMR5, 0 of 2 tested systems in Idaho County had at least one PFAS detection (0.0% of the UCMR5-tested subset - not of all 58 SDWIS systems).

What types of water sources supply Idaho County?

Water systems in Idaho County use GW (56 systems), SW (2 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. 41.7% of Idaho County's violations are health-based. Among counties with any SDWIS violations, this extract puts Idaho County in the higher health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

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

According to EPA SDWIS county population served used on /counties, Idaho County ranks #2,337 of 3,254 counties by people served, and #24 of 44 counties in Idaho. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Idaho

Idaho County, Idaho

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet ID049 · Idaho County 58 sys · 3,546 viol · #2337/3254

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

VIOL-SEVERE 96.6% flagged
HEALTH-MID 41.7% health
RANK-LOWER #2337/3254
PHOTO-FINISH ±0.2 pp
PFAS-CLEAN 0.0% detect
SRC-GW GW lead 97%
SYS-MID 58 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Fremont County (+ 0.2 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Idaho County ranks #2,337 of 3,254 counties by people served, and #24 of 44 counties in Idaho. See methodology · corpus placement.

Idaho County standing, mid-flagged corpus third

Flagged-system rate 96.6% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 41.7% is health-based share above the upper 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 #2,337 of 3,254 · #24 of 44 in Idaho.

Water Systems

System Name	Population	Violations	PFAS
Grangeville Water Dept	3,151	11	Clean
Cottonwood Water Dept	977	48	-
Kooskia Water Dept	607	13	Clean
Riggins City Of	434	50	-
North Idaho Correctional Institute	425	39	-
Pine Ridge Water and Sewer Dist	390	45	-
Elk City Water and Sewer Assn	320	337	-
Stites City Of	253	48	-
Kamiah Valley Company LLC	250	37	-
Monastery of St Gertrudes	200	38	-
Life Center Church	200	19	-
First Apostolic Acts Church	170	36	-
St John Bosco Academy	160	71	-
Blm Hammer Creek Recreation Site	150	3	-
Ferdinand City Of	133	81	-
White Bird City Of	125	214	-
Rapid River Water & Sewer Dist	120	35	-
Three Rivers Resort	120	36	-
Grangeville Golf and Country Club	100	40	-
Hoots Shop & Stay	100	34	-
Cottonwood Sales Yard	100	27	-
Kamiah Lds Church	100	18	-
The Coffee Loft	100	11	-
Country Court Community	89	182	-
Clearwater Water Dist	80	1,066	-
Lochsa Lodge	80	16	-
Wilderness Inn	80	22	-
Blm Slate Creek Rest Area	75	12	-
Usfs Wilderness Gateway Campground	75	10	-
Usfs Pittsburg Landing Campground	75	22	-
Usfs Fenn Ranger Station and Ycc Camp	74	23	-
Valley View Water and Sewer District	70	93	-
Pacific Cabinets Inc	62	29	-
Usfs Red River Ranger Station	56	32	-
Blm Pine Bar Recreation Site	50	2	-
Alacca Bible Camp	45	106	-
Usfs Powell Ranger Station	44	39	-
Southfork River Junction Lodge RV Park	40	30	-
Usfs Ohara Bar Campground	40	13	-
Canyon Pines RV Resort	40	12	-
Dale and Jills Sporting Goods	35	18	-
Fenn Community System	30	70	-
Harpster RV Park	30	45	-
Swiftwater RV Park and Store	30	28	-
Bear Den RV Resort	26	34	-
Keuterville Pub & Grub	25	53	-
Pine Vu Trailer Court	25	35	-
Usfs Powell Campground	25	30	-
Sheep Creek Rest Area Itd	25	53	-
Village 21 Water Dist	25	69	-

Compare beyond Idaho

Mid-flagged peers for Idaho County

Cross-state counties nearest Idaho County on flagged-system share (96.6%) and cumulative violation count (3,546). 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.