PlainWater
Counties → California

Mono County, California

Water Systems
93
Population Served
99,269
Total Violations
2,450
315 health-based
PFAS Detected
2
of 2 tested

Violation Analysis

95.7%
Systems with Violations
26.3
Avg Violations per System
12.9%
Health-Based Violations

Water Source Types

GW
44 systems (47%)
SW
6 systems (6%)

PFAS Contamination

2
Systems Tested
2
PFAS Detected
100.0%
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

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

No violations on record (2) One or more violations (48)

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
Robinson Creek Campground 50,562 22 -
Mammoth Cwd 8,234 13 Clean
Mammoth Mountain Ski Area - Outpost 14 7,736 31 Clean
Trumbull Lake Campground 7,423 28 -
June Lake PUD - Down Canyon 2,810 29 -
June Lake PUD Village 2,763 30 -
Bootleg Campground 2,467 18 -
Chris Flat Campground 1,585 21 -
Leavitt Campground 1,405 28 -
Usmc/Mtn Warfare Trng Ctr - Bridgeport 1,200 0 -
Mammoth Lakes Basin 1,000 2 -
East Fork Campground 750 9 -
Lee Vining Public Utility District 672 3 -
French Camp Campground 600 2 -
Bridgeport PUD 524 189 -
June Mountain Ski Area - Lower 514 53 -
June Mountain Ski Area - Upper 514 20 -
Mountain Meadows MWC 505 30 -
Annett's Mono Village 500 28 -
Convict Lake Campground 440 31 -
Usmc - Housing Coleville 424 3 -
Big Bend Campground 345 16 -
Twin Lakes Enterprises 325 39 -
Saddlebag Lake Campground 325 24 -
Lower Rock Creek Mutual Water Co. 310 42 -
Cal Trans - Crestview Rest Area 300 9 -
Csp - Bodie Shp 271 2 -
Crowley Lake Trailer Park 230 38 -
Coleville High School 216 22 -
Usfs Lee Vining Ranger Station 200 19 -
Tuff Campground 180 0 -
Crowley Lake Mutual Water Company 175 42 -
McGee Creek Campground 168 14 -
Tom's Place 156 56 -
Big Meadow Campground 154 19 -
Birchim Community Service District 150 52 -
McGee Creek Mobile Home Park 146 32 -
White Mountain Mutual Water Company 142 8 -
Grant Lake Marina 130 17 -
Topaz Lake RV Park 127 27 -
Pine Grove Campground 120 15 -
Hunewill Guest Ranch 115 24 -
Twin Lakes Resort 100 41 -
Hunewill's Doc and Al's Resort 100 22 -
Pokonobe Lodge Restaurant/Store 100 11 -
Crowley Lake General Store 100 24 -
Bridgeport Reservoir Marina and Cg 90 14 -
Wheeler Crest Csd 86 13 -
Sierra East HOA 84 90 -
Crystal Crag Water & Development Assoc. 75 27 -

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 Mono County? ▼
Mono County has 2,450 total drinking water violations across 93 water systems, of which 315 are health-based violations. 95.7% of systems have at least one violation.
How many people get water from Mono County systems? ▼
Water systems in Mono County serve approximately 99,269 people through 93 public water systems.
Has PFAS been detected in Mono County water? ▼
Of 2 water systems tested for PFAS in Mono County, 2 had PFAS detected (100.0% detection rate).
What types of water sources supply Mono County? ▼
Water systems in Mono County use GW (44 systems), SW (6 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. 12.9% of Mono 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.