County · California
Mono County, California: drinking water records
This overview covers 8 ZIP codes and 20 community water systems in Mono County. It also stands in for 2 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Mammoth Cwd CA2610001 | 8,234 | 300 | 0 | 0 | 0 ppb |
| June Lake PUD - Down Canyon CA2610004 | 2,810 | 0 | 0 | 3 | 2 ppb |
| June Lake PUD Village CA2610002 | 2,763 | 0 | 0 | 2 | 2.7 ppb |
| Bridgeport PUD CA2610003 | 524 | 0 | 0 | 9 | 1.9 ppb |
| Lower Rock Creek Mutual Water Co. CA2600538 | 310 | 0 | 0 | 1 | 0 ppb |
| Crowley Lake Trailer Park CA2600547 | 230 | 0 | 0 | 1 | 9.4 ppb |
| Utu Utu Gwaitu Paiute Tribe 090600159 | 222 | 0 | 0 | 16 | 5 ppb |
| Swanton Meadows OH2601212 | 180 | 0 | 0 | 1 | 2.4 ppb |
| Sierra East HOA CA2600622 | 84 | 0 | 0 | 21 | 4.4 ppb |
| Usmc/Mtn Warfare Trng Ctr - Bridgeport CA2610700 | 1,200 | 0 | 0 | 0 | 1.6 ppb |
| Lee Vining Public Utility District CA2610005 | 672 | 0 | 0 | 0 | 8 ppb |
| Mountain Meadows Mwc CA2600620 | 505 | 0 | 0 | 0 | 4.4 ppb |
| USMC - Housing Coleville CA2610701 | 424 | 0 | 0 | 0 | 0.9 ppb |
| Crowley Lake Mutual Water Company CA2600546 | 175 | 0 | 0 | 0 | 0 ppb |
| Birchim Community Service District CA2600501 | 150 | 0 | 0 | 0 | 5.2 ppb |
| White Mountain Mutual Water Company CA2600621 | 142 | 0 | 0 | 0 | 0 ppb |
| Wheeler Crest CSD CA2600714 | 86 | 0 | 0 | 0 | 1.6 ppb |
| Lundy Mutual Water Company CA2600532 | 70 | 0 | 0 | 0 | 3.7 ppb |
| Cold Water Canyon Mwc CA2600733 | 65 | 0 | 0 | 0 | 0 ppb |
| Chalfant Valley West M.W.C. CA2600699 | 45 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Mono County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 93512, 96133.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.