UNION PUBLIC UTILITY DISTRICT Water Quality Report
Serving roughly 4,774 people in Calaveras County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for UNION PUBLIC UTILITY DISTRICT
1 water provider directly on file, serving roughly 4,774 people in Calaveras County, California.
Quick answer: UNION PUBLIC UTILITY DISTRICT has no violations on file. One reading is worth knowing about: TTHM was measured at 93.39UG/L, among the highest of the 97 providers on file in this area. It's the most notable figure in this system's record among its 97 local peers.
Lead Summary
Lithium
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dichloroaceticacid
Trichloroaceticacid
Aggressive Index
Langelier Index (Source Temp.)
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
pH
Odor
Conductivity (at 25°C)
Color
Utility UNION PUBLIC UTILITY DISTRICTPopulation served 4,774Owner Local government
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2023
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 21.3 UG/L (ppb)
8/20/2025
TTHM
Detected: 93.39 UG/L (ppb)
8/20/2025
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)
8/20/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 2.64 UG/L (ppb)
8/20/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 0.92 MG/L (ppm)
1/15/2025
Sulfate
Detected: 0.72 MG/L (ppm)
1/15/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Sodium
Detected: 1.5 MG/L (ppm)
1/15/2025
Calcium
Detected: 2.8 MG/L (ppm)
1/15/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 10 MG/L (ppm)
1/15/2025
pH
Detected: 6.95 PH
1/15/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 50 µg/L (ppb)
11/4/2024
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: 13 MG/L (ppm)
1/15/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 10.2 UG/L (ppb)
8/20/2025
Trichloroaceticacid
Detected: 11.1 UG/L (ppb)
8/20/2025
Aggressive Index
Detected: 8.91 AGGR
1/15/2025
Langelier Index (Source Temp.)
Detected: -3.3 LANG
1/15/2025
Alkalinity, Total
Detected: 13 MG/L (ppm)
1/15/2025
TDS
Detected: 41 MG/L (ppm)
1/15/2025
Odor
Detected: 2.8 TON
1/15/2025
Conductivity (at 25°C)
Detected: 32 UMHO/CM
1/15/2025
Color
Detected: 12 UNITS
1/15/2025
Filtration considerations: See the table below for how whole-house carbon, under-sink reverse osmosis, and under-sink carbon systems compare against what's actually on file here. These are general system types, not a specific product recommendation.