Water Quality Lookup / California / Calaveras County

EPA SDWIS · Calaveras County, California · 97 providers profiled

Calaveras County, CA Water Quality Report

Calaveras County is served by 97 major public water systems on file with the EPA.

Data current as of July 2026

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Results for Calaveras County, CA

97 water providers on file for this county, sorted by population served.

Quick answer: Calaveras County has 97 water providers profiled, sorted by population served.

Violations on file

Coliform (TCR)

Older/archived health-based violation

Found at 3 of 97 providers

Selenium

Older/archived health-based violation

Found at 1 of 97 providers

Nitrate

Older/archived health-based violation

Found at 1 of 97 providers

Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.

Surface Water Treatment Rule

Older/archived health-based violation

Found at 1 of 97 providers

Lead And Copper Rule Revisions

Currently open health violation

Found at 4 of 97 providers

Antimony, Total

Older/archived health-based violation

Found at 1 of 97 providers

Contaminants found

Metals

Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper

Lead Summary

Detected: 0.02 mg/L (ppm)

Found at 25 providers

Iron

Detected: 700 UG/L (ppb)

Found at 6 providers

Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.

Manganese

Detected: 330 UG/L (ppb)

Found at 4 providers

Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.

Zinc

Detected: 720 UG/L (ppb)

Found at 6 providers

Lead

Detected: 16 UG/L (ppb)

Found at 4 providers

A metal that can leach from old pipes, solder, and fixtures. Current medical guidance holds there is no truly safe level of lead exposure, especially for children and pregnant women.

Copper, Free

Detected: 520 UG/L (ppb)

Found at 7 providers

Vanadium, Total

Detected: 6.7 UG/L (ppb)

Found at 2 providers

Barium

Detected: 179 UG/L (ppb)

Found at 3 providers

Chromium, Hex

Detected: 0.77 UG/L (ppb)

Found at 4 providers

Aluminum

Detected: 98 UG/L (ppb)

Found at 3 providers

Copper Summary

Detected: 225 mg/L (ppm)

Found at 3 providers

Disinfection Byproducts

Formed when chlorine used to disinfect water reacts with organic matter

Totalhaloaceticacids (HAA5)

Detected: 59 UG/L (ppb)

Found at 12 providers

TTHM

Detected: 93.39 UG/L (ppb)

Found at 13 providers

A group of disinfection byproducts formed when chlorine reacts with organic matter. Long-term exposure above the legal limit has been linked to increased cancer risk in some studies.

Chloroform

Detected: 90.75 UG/L (ppb)

Found at 11 providers

One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.

Bromodichloromethane

Detected: 10.2 UG/L (ppb)

Found at 11 providers

Dibromochloromethane

Detected: 1.7 UG/L (ppb)

Found at 5 providers

Inorganics

Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride

Nitrate

Detected: 5.2 MG/L (ppm)

Found at 11 providers

Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.

Chloride

Detected: 13 MG/L (ppm)

Found at 14 providers

Sulfate

Detected: 91 MG/L (ppm)

Found at 13 providers

Fluoride

Detected: 0.2 MG/L (ppm)

Found at 4 providers

Often added deliberately for dental health; can also occur naturally.

Nitrate-Nitrite

Detected: 3 MG/L (ppm)

Found at 4 providers

Nitrite

Detected: 0.29 MG/L (ppm)

4/8/2025

Minerals

Everyday minerals that mainly affect taste and water hardness

Magnesium

Detected: 33 MG/L (ppm)

Found at 11 providers

Potassium

Detected: 3.4 MG/L (ppm)

Found at 4 providers

Sodium

Detected: 18.8 MG/L (ppm)

Found at 14 providers

Calcium

Detected: 69 MG/L (ppm)

Found at 13 providers

Properties

General water characteristics like pH, hardness, and cloudiness (turbidity)

Hardness, Total (ASCACO3)

Detected: 226 MG/L (ppm)

Found at 7 providers

Gross Alpha Particle Activity

Detected: 2.66 PCI/L

Found at 3 providers

pH

Detected: 7.9 PH

Found at 12 providers

A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.

pH, Field

Detected: 8.66 PH

Found at 3 providers

PFAS & Emerging Contaminants

Human-made "forever chemicals" and other substances not yet fully regulated

Lithium

Detected: 50 µg/L (ppb)

Found at 2 providers

Occurs naturally in some groundwater. Not currently federally regulated in drinking water.

Calculated Parameters

Values worked out mathematically from other test results, not measured directly

Alkalinity, Bicarbonate

Detected: 207 MG/L (ppm)

Found at 15 providers

Other

Additional substances tested that don't fit neatly into the categories above

Aggressive Index

Detected: 11.44 AGGR

Found at 7 providers

Alkalinity, Total

Detected: 180 MG/L (ppm)

Found at 15 providers

TDS

Detected: 320 MG/L (ppm)

Found at 13 providers

Turbidity

Detected: 7.8 NTU

Found at 11 providers

A measure of water cloudiness from suspended particles.

Conductivity (at 25°C)

Detected: 510 UMHO/CM

Found at 9 providers

Color

Detected: 94 UNITS

Found at 6 providers

Odor

Detected: 89 TON

Found at 4 providers

Dichloroaceticacid

Detected: 22 UG/L (ppb)

Found at 10 providers

Trichloroaceticacid

Detected: 24 UG/L (ppb)

Found at 10 providers

Langelier Index (Source Temp.)

Detected: -3.3 LANG

1/15/2025

Perchlorate

Detected: 1.1 UG/L (ppb)

4/2/2025

Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.

Carbon, Total

Detected: 2.3 MG/L (ppm)

Found at 7 providers

Monochloroaceticacid

Detected: 5.2 UG/L (ppb)

Found at 5 providers

Filtration considerations: General system types, not a specific product recommendation.

Contaminant	Whole-House Carbon	Under-Sink RO	Under-Sink Carbon
Total Trihalomethanes (TTHM)	Yes	Yes	Yes
Haloacetic Acids (HAA5)	Yes	Yes	Yes
Chloroform	Yes	Yes	Yes
Chlorine / Taste	Yes	Yes	Yes
Sediment / Turbidity	Yes	Yes	Yes
Trichloroethylene	Yes	Yes	Yes
Tetrachloroethylene	Yes	Yes	Yes
cis-1,2-Dichloroethylene	Yes	Yes	Yes
1,1-Dichloroethylene	Yes	Yes	Yes
Bromoform	Yes	Yes	Yes
Bromodichloromethane	Yes	Yes	Yes
Dibromochloromethane	Yes	Yes	Yes
1,1,2-Trichloroethane	Yes	Yes	Yes
Vinyl Chloride	Yes	Yes	Yes
Carbon Tetrachloride	Yes	Yes	Yes
Benzene	Yes	Yes	Yes
Toluene	Yes	Yes	Yes
Xylene	Yes	Yes	Yes
Totalhaloaceticacids (HAA5)	Yes	Yes	Yes
Lead	Partial	Yes	Partial
Arsenic	Partial	Yes	Partial
Chromium-6 (Hexavalent)	Partial	Yes	Partial
Copper	Partial	Yes	Partial
Combined Uranium	Partial	Yes	Partial
PFOA	Partial	Yes*	Partial
PFOS	Partial	Yes*	Partial
Nitrate	Partial	Yes	Partial
Combined Radium	Partial	Yes	Partial
Aggressive Index	Partial	Yes	Partial
Alkalinity, Total	Partial	Yes	Partial
TDS	Partial	Yes	Partial
Chloride	Partial	Yes	Partial
Sulfate	Partial	Yes	Partial
Fluoride	Partial	Yes	Partial
Iron	Partial	Yes	Partial
Manganese	Partial	Yes	Partial
Zinc	Partial	Yes	Partial
Conductivity (at 25°C)	Partial	Yes	Partial
Color	Partial	Yes	Partial
Copper, Free	Partial	Yes	Partial
Odor	Partial	Yes	Partial
Nitrate-Nitrite	Partial	Yes	Partial
Vanadium, Total	Partial	Yes	Partial
Barium	Partial	Yes	Partial
Chromium, Hex	Partial	Yes	Partial
Lithium	Partial	Yes*	Partial
Dichloroaceticacid	Partial	Yes	Partial
Trichloroaceticacid	Partial	Yes	Partial
Langelier Index (Source Temp.)	Partial	Yes	Partial
Perchlorate	Partial	Yes	Partial
Aluminum	Partial	Yes	Partial
Carbon, Total	Partial	Yes	Partial
Monochloroaceticacid	Partial	Yes	Partial
Nitrite	Partial	Yes	Partial
Coliform Bacteria (indicator)	No	Yes	No
Magnesium	No	Partial	No
Potassium	No	Partial	No
Sodium	No	Partial	No
Calcium	No	Partial	No
Alkalinity, Bicarbonate	No	No	No
Hardness, Total (ASCACO3)	No	No	No
Gross Alpha Particle Activity	No	No	No
pH	No	No	No
pH, Field	No	No	No

Browse by city

Individual water providers

CCWD - EBBETTS PASS No violations on file — pop. 11,545
CALAVERAS COUNTY FAIRGROUNDS No violations on file — pop. 9,999
CCWD - JENNY LIND No violations on file — pop. 9,861
CALAVERAS PUD No violations on file — pop. 6,286
CCWD - COPPER COVE No violations on file — pop. 5,187
BLUE LAKE SPRINGS MUT WTR No violations on file — pop. 4,841
UNION PUBLIC UTILITY DISTRICT No violations on file — pop. 4,774
ANGELS, CITY OF Open violation — pop. 3,836 — serves ANGELS CAMP
U.S. ARMY CORP NEW HOGAN No violations on file — pop. 1,860
CCWD - WEST POINT No violations on file — pop. 1,043
VALLEY SPRINGS PUD No violations on file — pop. 900
CAMANCHE SOUTH SHORE-EBMUD No violations on file — pop. 828

SNOWSHOE SPRINGS ASSN. No violations on file — pop. 686
FRICOT TRAINING ACADEMY No violations on file — pop. 500
FRICOT TRAINING ACADEMY No violations on file — pop. 500
PINEBROOK MUTUAL WATER CO No violations on file — pop. 500
BIG MEADOWS CAMPGROUND No violations on file — pop. 390
CALAVERAS BIG TREES SP, NORTH GROVE No violations on file — pop. 350
ANGELS CAMP RV/CAMPING RESORT No violations on file — pop. 288
CCWD - WALLACE No violations on file — pop. 255
CAMP WOLFEBORO No violations on file — pop. 250
MOUNTAIN RANCH KITCHEN, THE No violations on file — pop. 228
EL TORERO RESTAURANT No violations on file — pop. 225
MOANING CAVERN No violations on file — pop. 215
TOYON MIDDLE SCHOOL No violations on file — pop. 200
OKIZU FOUNDATION No violations on file — pop. 165
ROSSETTIS INN No violations on file — pop. 150
MOUNTAIN RANCH WATER SYSTEM No violations on file — pop. 150
RITE OF PASSAGE/SIERRA RIDGE Open violation — pop. 150
TOYON PARK WATER SYSTEM LLC No violations on file — pop. 150
CAMP MENZIES No violations on file — pop. 150
CAMP LODESTAR No violations on file — pop. 150
FIRST MACE MEADOW ASSOC. No violations on file — pop. 133 — serves MACE MEADOW UNI
MERCED OUTBOARD CLUB No violations on file — pop. 125
RAILROAD FLAT ELEMENTARY Older violation on record — pop. 125
AMERICAN LEGION POST #376 No violations on file — pop. 120
SHERMAN ACRES MUTUAL WATER ASN No violations on file — pop. 120
ROYAL MOUNTAIN KING MINE No violations on file — pop. 110
SKY HIGH RANCH HOA No violations on file — pop. 103
CCWD COPPEROPOLIS No violations on file — pop. 100
CUSD DISTRICT OFFICE No violations on file — pop. 100
GLORY HOLE RECREATION AREA Older violation on record — pop. 100
NEW MELONES LAKE MARINA No violations on file — pop. 100
STANISLAUS RIVER CAMPGROUND No violations on file — pop. 100
MORNING STAR OUTREACH No violations on file — pop. 100
ANGELS ARM WATER PLANT No violations on file — pop. 100
LILI VALLEY WATER CO. Open violation — pop. 99
DUNROVIN MOBILE HOME VILLAGE No violations on file — pop. 99
CCWD - SHEEP RANCH No violations on file — pop. 89
VALLECITO CONSERVATION CAMP Older violation on record — pop. 85
FRICOT CITY No violations on file — pop. 85
VINE & BRANCH FELLOWSHIP No violations on file — pop. 85
CALIFORNIA CAVERNS No violations on file — pop. 80
STONE CORRAL COMMUNITY CHURCH No violations on file — pop. 80
BURSON FULL GOSPEL CHURCH No violations on file — pop. 80
ROBERT MC SKIMMING No violations on file — pop. 75
UNITED PARCEL SERVICE No violations on file — pop. 75
CAMP MADONNA OF PEACE No violations on file — pop. 70
GREENWOOD SOLAR CENTER No violations on file — pop. 70
GREENWOOD SOLAR CENTER No violations on file — pop. 70
CALAVERAS BIG TREES SP, OAK HOLLOW No violations on file — pop. 70
MINERAL MOUNTAIN MUTUAL WATER Open violation — pop. 67
BLUNDER INN No violations on file — pop. 60
GRINGO CHUCK S No violations on file — pop. 60
SALT SPRINGS VALLEY RES. & CAMPGRND No violations on file — pop. 60
SAWMILL PIZZA No violations on file — pop. 56
COTTAGE SPRINGS WATER CO. No violations on file — pop. 51
OLD STATION G.S., BIG BAR CMPG No violations on file — pop. 50
COOK S LANDING Older violation on record — pop. 50
CALIF DEPT PARKS & RECRE No violations on file — pop. 50
ENVIRON TRVLNG COMPANIONS ETC No violations on file — pop. 50
MOUNTAIN RANCH ELEMENTARY Older violation on record — pop. 50
DREAM MOUNTAIN CHRISTIAN CAMP INC. No violations on file — pop. 50
TAMARACK CABIN OWNERS ASSN No violations on file — pop. 50
SENDER'S MARKET No violations on file — pop. 50
PARDEE CENTER No violations on file — pop. 50
TOYON INDUSTRIAL Older violation on record — pop. 48
MACT HEALTH BOARD, INC. No violations on file — pop. 35
BIG BAR, R.S. No violations on file — pop. 30
PETTICOAT WATER SYSTEM No violations on file — pop. 30
HANSON S ROOST RESTAURANT No violations on file — pop. 30
SWISS 3 WAY WATER SYSTEM No violations on file — pop. 30
LAKESIDE MOBILE ESTATES No violations on file — pop. 30
TAMARACK SPRINGS MUTUAL WATER No violations on file — pop. 30
RAIL ROAD FLAT GENERAL STORE No violations on file — pop. 25
BUN ON THE RUN No violations on file — pop. 25
COTTAGE SPRINGS REST AREA No violations on file — pop. 25
HOGAN S LAST STOP No violations on file — pop. 25
SWISS RANCH CATERING COMPANY No violations on file — pop. 25
CAL TRANS CABBAGE PATCH No violations on file — pop. 25
TAMARACK PINES INN No violations on file — pop. 25
BURSON DONUT No violations on file — pop. 25
CHANGING ECHOES No violations on file — pop. 25
OAKENDELL, INC. No violations on file — pop. 25
GLORY HOLE CENTER No violations on file — pop. 25
CALAVERAS COUNTY AIRPORT No violations on file — pop. 25
TAMARACK LODGE AT BEAR VALLEY No violations on file — pop. 0

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What is TTHM? Understanding EPA Violation Status Is Chromium-6 Dangerous? Whole-House vs. Under-Sink Filtration Lead and Copper in Drinking Water What is PFAS? Arsenic and Uranium Explained Nitrate and Fluoride Explained Water Hardness, pH, and Turbidity What is Coliform Bacteria?