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Counties → California

Nevada County, California

SDWIS compliance plate

Sheet CA057 · Nevada County 84 sys · 1,551 viol · #558/3254

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

  • VIOL-SEVERE 84.5% flagged
  • HEALTH-HIGH 49.5% health
  • RANK-TOP #558/3254
  • PHOTO-FINISH ±0.8 pp
  • PFAS-LOW 16.7% detect
  • SRC-GW GW lead 88%
  • SYS-MID 84 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Placer County ( -0.8 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Nevada County ranks #558 of 3,254 counties by people served, and #37 of 58 counties in California. See methodology · corpus placement.

Nevada County standing, lower-flagged corpus third

Flagged-system rate 84.5% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 49.5% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 16.7% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #558 of 3,254 · #37 of 58 in California.

Flagged-rate neighbourhood around Nevada County

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

0% 20% 40% 60% 80% 100% Alpine · lowest Placer · near Yuba · near Sutter · highest 70% 83.6% 83.7% 84.5% 85.5% 85.7% 97.1%

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

Water Systems

System Name Population Violations PFAS
Truckee-Donner PUD, Main 36,730 6 Detected
Nevada ID - E. George, Banner Mountain 17,154 0 Clean
Nevada ID - Loma Rica 14,072 0 Clean
Nevada ID - Lake Wildwood 9,108 0 Clean
Nevada ID - Lake of Pines 6,870 0 Clean
City of Grass Valley 4,947 4 Clean
City of Nevada City 3,148 5 -
South Yuba River State Park 800 3 -
Bitney Springs Center Water System 547 32 -
Mother Truckers Water System 450 0 -
Plavada Community Association 384 78 -
Penn Valley Shopping Center 332 27 -
Washington Water District 330 58 -
Martis Creek-US Army Corps of Engineers 322 2 -
Shady Creek Outdoor School 315 91 -
Donner Summit Public Utility District 310 27 -
Creekside Village 300 20 -
Wood Camp - Water System 281 7 -
Rough & Ready Village 268 95 -
Tahoe Timber Trails 254 1 -
Nid Scotts Flat Lake Reservoir 253 48 -
Pleasant Ridge School 250 28 -
Ananda Village 222 18 -
Skippers Cove 215 26 -
Lake Spaulding Campground 204 2 -
Peninsula Campground Water System 202 21 -
Harmony Ridge Resort 201 4 -
Sierra Energy #3 200 32 -
Kingvale Property Owners & Water Users 180 14 -
Clear Creek School 160 16 -
Camp Ross Relles 153 18 -
Marin Sierra Boy Scouts of America 151 33 -
Donner Mine Camp Inc 151 6 -
5 Mile House 150 2 -
Bigleys Market / Brass Rail 150 2 -
Camp Rucker Lake 150 23 -
Petersons Corner Water System 150 9 -
Harmony Ridge Market 150 0 -
Tahoe Forest Church 145 2 -
Diamond Arrow Conference Center 135 13 -
Sierra Family Medical Clinic 125 2 -
Twin Ridges Grizzly Hill School 125 31 -
Malakoff Diggins Shp 125 3 -
Twin Ridges Oak Tree School 120 33 -
Floriston Water System 110 33 -
Naggiar Vineyards 109 0 -
Truckee River RV Park 103 11 -
New Solutions Construction Water System 102 23 -
Heauser's Plaza Center 100 0 -
Sierra Estates Mutual Water Company 100 66 -

Compare beyond California

Lower-flagged peers for Nevada County

Cross-state counties nearest Nevada County on flagged-system share (84.5%) and cumulative violation count (1,551). 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.