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Counties → Idaho

Ada County, Idaho

SDWIS compliance plate

Sheet ID001 · Ada County 87 sys · 5,380 viol · #137/3254

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

  • VIOL-SEVERE 92.0% flagged
  • HEALTH-LOW 14.3% health
  • RANK-TOP #137/3254
  • PHOTO-FINISH ±0.4 pp
  • PFAS-MID 37.5% detect
  • SRC-GW GW lead 97%
  • SYS-MID 87 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Gooding County (+ 0.4 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Ada County ranks #137 of 3,254 counties by people served, and #1 of 44 counties in Idaho. See methodology · corpus placement.

Ada County standing, lower-flagged corpus third

Flagged-system rate 92.0% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 14.3% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 37.5% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #137 of 3,254 · #1 of 44 in Idaho.

Flagged-rate neighbourhood around Ada County

Lowest/highest poles plus in-state counties nearest Ada County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Valley · lowest Ada · this county Lemhi · near Camas · highest 89.5% 90% 92% 92.3% 93.2% 93.3% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

System Name Population Violations PFAS
Veolia Water Idaho 264,978 240 Clean
Meridian Water Dept 147,340 64 Detected
Kuna City Of 32,038 554 Clean
Star Sewer and Water Dist Water System 14,000 30 Clean
Garden City Water and Sewer System 12,500 245 Detected
Capitol Water Corp 9,000 113 Detected
Eagle, City of (Western Zone) 6,108 10 Clean
Eagle, City of (Eastern Zone) 3,702 51 Clean
Idoc Sbx Complex 3,309 69 -
Idoc Idaho State Correctional Center 2,204 62 -
Dry Creek Water Company LLC 1,125 5 -
Idpr Lucky Peak Sp Discovery Unit 1,000 128 -
Cs Beef Packing 850 2 -
Amity Locust Grove Lds Church 840 46 -
Hillsdale Estates Homeowners Assn 800 125 -
Idpr Lucky Peak Sp Sandy Point 777 26 -
Desert View Estates Water Corp 650 107 -
Idaho National Guard Ortc Facility 600 30 -
Rustic Acres Mobile Home Park 540 55 -
City of Eagle - Valnova 490 0 -
City of Eagle - Avimor 490 0 -
Idoc Mountain View Transformation Center 456 27 -
Flying H Trailer Ranch 430 35 -
Eagle Glen Homeowners Assn Inc 300 23 -
Pueblo Lindo Eagle 300 9 -
Kuna Blackcat Lds Church 300 15 -
Eagle Lds Church #21 300 5 -
South Maple Grove Stake Center 300 34 -
Wymosa Water Assn Inc 280 397 -
Paradise Estates Water Corp 273 102 -
West Meadows Estates 270 51 -
Arrowrock Ranch 250 107 -
NW Lineman College 250 0 -
Idaho National Guard - Snake River Train 250 0 -
Ttb Brumpton 250 3 -
Greenhills Estates 3 200 173 -
Klugherz Water Corp 200 41 -
Eagle Meadows MHP 195 13 -
Evans Water Corp 137 47 -
Eagle Mhc 135 54 -
Linda Vista Mobile Home Park 125 57 -
Krizview Park 120 53 -
Boise Stage Stop 100 188 -
Chaparral Water Assn 100 90 -
Bodacious Pig BBQ 100 6 -
Willowbrook Estates Property Owners 100 188 -
Kuna East 100 0 -
Hampton Homes Home Owners Assn 95 30 -
Eagle West Subd Water Assn 92 16 -
Terrace Water Corp Inc 84 7 -

Compare beyond Idaho

Lower-flagged peers for Ada County

Cross-state counties nearest Ada County on flagged-system share (92.0%) and cumulative violation count (5,380). 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

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.