Tap Truth EPA drinking water records, in plain English

County drinking water records

Tuolumne County, CA drinking water systems

48 community water systems serve Tuolumne County, CA, reporting 63,604 people served in all. A system that also serves other counties counts all of its customers here.

13 of them (27%) had at least one health-based violation in the last 10 years. 14 systems still have one unresolved.

27 rely mainly on groundwater and 21 on surface water, counting water bought from other systems.

44 systems filed a lead service line inventory listing 0 lead lines, 0 galvanized lines that must be replaced and 39 lines of unknown material.

2 more systems are placed in Tuolumne County, CA by the county their records name because they have no service area map that lines up with their own records, so they are listed apart and not counted here.

Community water systems
48
People served, sum of each system's own figure
63,604
Systems with a health-based violation, last 10 years
13
Systems with one unresolved
14
Lead service lines in inventories
0

Water systems serving Tuolumne County

48 systems

People served is each system's own figure for its whole service area. Violation counts cover the last 10 years of EPA records.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Tud - Upper Basin Water System Twain Harte, Mi-Wuk Village and 1 more and land outside them 13,280 Surface water 0 0 0
Tud - Sonora/Jamestown Water System Sonora, Jamestown and 1 more 11,054 Surface water 0 0 0
Tud - Columbia Water System Columbia 5,463 Surface water 0 0 0
CDCR - Sierra Conservation Center Outside cities and towns 3,571 Surface water 4 0 0
Groveland Community Serv Dist Pine Mountain Lake and Groveland 3,400 Surface water 3 2 0
Lake Don Pedro CSD Lake Don Pedro 3,240 Surface water 1 2 0
Twain Harte Community Services District Twain Harte 2,378 Surface water 0 0 0
Mi Wuk Village Mut Wtr Co Mi-Wuk Village and Sierra Village 2,163 Surface water 0 0 0
Cold Springs Water Co Cold Springs 1,771 Surface water 0 0 0
Tud - Ponderosa Tuolumne City and land outside it 1,767 Surface water 0 0 0
Tud - Tuolumne Water System Tuolumne City and Sonora 1,761 Surface water 0 0 0
Pinecrest Permittees Assn Outside cities and towns 1,298 Surface water 1 2 No inventory
Del Oro Water Company - Strawberry Div. Strawberry and land outside it 1,295 Surface water 2 0 0
Phoenix Lake Estates CC MWC Phoenix Lake 1,168 Groundwater 0 0 0
Sonora Water Resources, Inc Jamestown 1,154 Purchased surface water 0 0 0
Sonora Meadows Mutual Wtr Co Mono Vista 1,123 Purchased surface water 1 2 No inventory
Don Pedro Rec Ag:flem.Meadows Outside cities and towns 1,041 Surface water 0 0 0
Tud-Apple Valley Estates Phoenix Lake 826 Groundwater 0 0 0
Belleview Oaks Mutual Water Co Phoenix Lake 468 Groundwater 0 0 0
Mi Wuk Heights MWC Mi-Wuk Village 445 Groundwater 0 0 0
Slide Inn Snowbowl Water Co Mono Vista 417 Groundwater 0 0 0
Sierra Park Water Company Inc. Sierra Village 400 Groundwater 0 0 No inventory
Leisure Pines Mutual Water Co Outside cities and towns 340 Groundwater 1 3 0
Cascade Estates Outside cities and towns 316 Groundwater 0 0 0
Bluebell Valley MWC Outside cities and towns 282 Groundwater 0 0 0
Peppermint Creek MHP Outside cities and towns 280 Surface water 1 0 0
Rawhide Mutual Water Company Outside cities and towns 269 Groundwater 0 0 0
Sonora Estates Mobile Home Park East Sonora 235 Groundwater 0 0 0
Tamarron Mobile Home Park East Sonora 225 Groundwater 0 0 0
Sugar Pine RV Resort Outside cities and towns 219 Groundwater 0 0 0
Golden Sierra Estates_fka Mother Lode East Sonora 210 Groundwater 0 1 0
Twain Harte Valley MWC Twain Harte 202 Surface water 1 3 0
Alpine Acres Mutual Water Co Mono Vista 195 Groundwater 1 2 No inventory
Muller Mutual Water Company Outside cities and towns 154 Purchased surface water 0 0 0
Cal Fire Baseline Conservation Camp Outside cities and towns 150 Surface water 6 2 0
Sierra Twain Harte MHP Outside cities and towns 129 Groundwater 0 0 0
49ER Trailer Ranch Columbia 115 Groundwater 0 0 0
Mono Vista Ranch MHP Soulsbyville 105 Groundwater 0 0 0
Long Barn Property Owners Long Barn and Sierra Village 97 Groundwater 0 1 0
Tud-Peaceful Pines Water System Sierra Village 92 Groundwater 0 0 0
Columbia Mobile Home Park Columbia 89 Groundwater 0 0 0
Yosemite Vista Estates Pine Mountain Lake 85 Groundwater 0 1 0
Rambling Hills Estates Columbia 78 Groundwater 0 0 0
Gold Rush Mobile Home Park Columbia 67 Groundwater under direct influence 0 0 0
Tud-Wards Ferry Ranches Outside cities and towns 62 Groundwater 0 0 0
Ponderosa Mobile Home Park Phoenix Lake 52 Groundwater 2 2 0
Yosemite NPS-Hodgdon Meadow Outside cities and towns 51 Groundwater 0 1 0
Sierra Village Mobile Home Park Sierra Village 22 Groundwater 1 2 0

Systems placed by county record in Tuolumne County

2 systems

EPA has no service area map for these systems. They are placed by the county their records name (the counties EPA lists them serving, or the county coded in their IDs where EPA lists none), and without a map they are not counted in the figures above.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Sierra Village Mutual Water Co County on record 361 Groundwater 0 0 0
Tuolumne Me-Wuk Ridgeline County on record 30 Purchased surface water 0 0 0

Cities and towns in Tuolumne County

16 places

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Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations