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Counties → California

Sierra County, California

SDWIS compliance plate

Sheet CA091 · Sierra County 33 sys · 752 viol · #2208/3254

VIOL-SEVERE · HEALTH-MID · RANK-LOWER · PHOTO-FINISH · PFAS-NONE · SRC-GW · SYS-SMALL · BOOK-MOST

  • VIOL-SEVERE 93.9% flagged
  • HEALTH-MID 32.0% health
  • RANK-LOWER #2208/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-NONE No UCMR5 set
  • SRC-GW GW lead 94%
  • SYS-SMALL 33 systems
  • BOOK-MOST 6/7 fields

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

According to EPA SDWIS county population served used on /counties, Sierra County ranks #2,208 of 3,254 counties by people served, and #57 of 58 counties in California. See methodology · corpus placement.

Sierra County standing, mid-flagged corpus third

Flagged-system rate 93.9% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 32.0% is health-based share above the upper third (> 24.5%) . No UCMR5 tests in this extract for Sierra County . Population served ranks #2,208 of 3,254 · #57 of 58 in California.

Flagged-rate neighbourhood around Sierra County

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

0% 20% 40% 60% 80% 100% Alpine · lowest Riverside · near Sierra · this county Sutter · highest 70% 93.4% 93.5% 93.8% 93.9% 93.9% 97.1%

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

Water Systems

System Name Population Violations PFAS
Sardine Lake Resort 5,040 14 -
Tnf-Logger & Stampede Rc 1,200 42 -
City of Loyalton 983 7 -
Downieville Public U.d. 783 20 -
Sierra CSA #5, Sierra Brooks 726 13 -
Sierra Water Resources - Sierra City 324 105 -
Tnf-Aspen Creek/Pass Creek 300 28 -
Bassett's Station 300 5 -
Sierra City Water Works, Inc. 250 36 -
Treasure Mountain Camp 200 8 -
Sierraville P.U.D. 200 28 -
Tnf-Cal-Ida Well 200 21 -
Sierra Co. W.w.d #1 Calpine 182 117 -
Shaffer S High Sierra Camp 131 25 -
Greene Acres Prop. O.a. 129 33 -
Packer Lake Lodge 125 35 -
Tnf-Wild Plum Cg 100 26 -
Tnf-Sardine Lake/Salmon Creek 100 24 -
Tnf-Indian Valley/Rocky Rest Cg 95 3 -
Tnf-Chapman Cg 95 9 -
Alleghany County W.D. 82 20 -
Tnf-Cottonwood Cg 75 32 -
Tnf-Little Truckee WS 75 9 -
Tnf-Loganville Cg 70 4 -
The Yubaverse 58 25 -
New Age Church of Being-Sierra Hot Spr. 50 11 -
Tnf-Union Flat Cg 40 3 -
Tnf-Yuba Pass Cg 40 0 -
Camp Leonard, Sierra NV F.c. 30 1 -
Webber Lake Campground 26 0 -
Pilot Lake Camp 25 2 -
Salmon Lake Lodge 25 38 -
Sierra Pines Resort 25 8 -

Compare beyond California

Mid-flagged peers for Sierra County

Cross-state counties nearest Sierra County on flagged-system share (93.9%) and cumulative violation count (752). 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.