PlainWater
Counties → California

Lassen County, California

Water Systems
55
Population Served
24,759
Total Violations
421
218 health-based
PFAS Detected
1
of 2 tested

Violation Analysis

72.7%
Systems with Violations
7.7
Avg Violations per System
51.8%
Health-Based Violations

Water Source Types

GW
50 systems (91%)

PFAS Contamination

2
Systems Tested
1
PFAS Detected
50.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Lassen California water systems by violation status, EPA SDWIS records.

No violations on record (13) One or more violations (37)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
City of Susanville 7,811 11 Clean
Cdcr-High Desert State Prison 3,857 20 Clean
Herlong Public Utility District 2,114 2 -
Westwood C.s.d. 1,662 14 -
Lassen Community College Dist. 1,380 7 -
Sierra Army Depot 1,200 19 -
Leavitt Lake Csd 950 2 -
Lake Forest Mutual W.C. 565 22 -
Lassen County Water District #1 450 2 -
Clear Creek Csd-Westwood 400 18 -
Janesville Elementary School 400 16 -
Caltrans-Honey Lake Srra 350 10 -
Spaulding Eagle Lake MWC 317 8 -
Susan Hills Estates WC 252 8 -
Shaffer Elementary School 250 5 -
Dollar General Janesville 250 0 -
Johnstonville Elementary School 230 8 -
Richmond Elementary School 221 10 -
Lnf-Eagle Lake Campgrounds 200 10 -
Long Valley Charter School 196 2 -
Susan River Park Water Co. 140 35 -
Mountain Valley Latter-Day Saints Church 110 0 -
Cal Fire-Intermountain Conservation Camp 108 14 -
Lnf-Bogard Work Center/Cal Trans Srra 100 10 -
Eagle Nest Homeowners' Association 84 18 -
Dollar General Doyle 80 0 -
Pineview Mobile Home Park 80 17 -
Little Valley Csd 70 12 -
Eagle Lake RV Park 68 24 -
Lassen Mobile Home Park 62 16 -
Lahontan Heights Home. Assoc. 56 4 -
Sierra Cascade Nursery 55 1 -
Diamond Mountain Golf Club 54 14 -
Point Horizon Institute 48 6 -
Clear Creek Latter Day Saints Church 40 3 -
Lnf-Eagle Lake Ranger Station 40 8 -
Johnstonville Water System 40 16 -
Lassen Co. Off. of Education 32 8 -
Wayside Inn Market 30 4 -
Doyle Payless Shell 30 0 -
Days End RV Park 27 3 -
Pizza Factory Janesville 25 0 -
Janesville Chevron 25 0 -
Artisan Coffee 25 0 -
Super Y Market and Villa Monte Motel 25 0 -
Leavitt Lake Market 25 0 -
Hallelujah Junction Market 25 0 -
Janesville Fire Hall 25 0 -
Johnstonville Quality Foods 25 0 -
Mountain Meadow Ranch 25 0 -

Other Counties in California

Los Angeles County
276 systems · 10,109,089 served · 3,972 violations
San Diego County
197 systems · 3,744,323 served · 4,832 violations
Orange County
46 systems · 3,201,893 served · 507 violations
Riverside County
201 systems · 2,839,125 served · 6,103 violations
San Bernardino County
318 systems · 2,830,626 served · 4,611 violations
Alameda County
27 systems · 2,249,634 served · 275 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Lassen County? ▼
Lassen County has 421 total drinking water violations across 55 water systems, of which 218 are health-based violations. 72.7% of systems have at least one violation.
How many people get water from Lassen County systems? ▼
Water systems in Lassen County serve approximately 24,759 people through 55 public water systems.
Has PFAS been detected in Lassen County water? ▼
Of 2 water systems tested for PFAS in Lassen County, 1 had PFAS detected (50.0% detection rate).
What types of water sources supply Lassen County? ▼
Water systems in Lassen County use GW (50 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. 51.8% of Lassen County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - 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 Editorial

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.