Serving roughly 100,000 people in El Dorado County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for SOUTH TAHOE PUD - MAIN
1 water provider directly on file, serving roughly 100,000 people in El Dorado County, California.
Quick answer: SOUTH TAHOE PUD - MAIN has no violations on file. One reading is worth knowing about: Sodium was measured at 18MG/L, among the highest of the 303 providers on file in this area. It's the most notable figure in this system's record among its 303 local peers.
Lead Summary
Copper Summary
PFHXA
PFHPA
PFPEA
PFOA
PFBS
PFOS
PFHXS
PFBA
Lithium
Aggressive Index
Temperature (CENTIGRADE)
Langelier Index (Source Temp.)
Magnesium
Potassium
Sodium
Calcium
Bromide
Orthophosphate
Alkalinity, Total
Alkalinity, Bicarbonate
Alkalinity, Carbonate
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
Fluoride
Nitrate-Nitrite
Nitrate
Turbidity
Radon
Combined Uranium
pH, Field
Molybdenum, Total
Vanadium, Total
Hexachlorobutadiene
Naphthalene
1, 2, 3-Trichlorobenzene
Methylethylketone
Carbondioxide
Iron
Manganese
Chromium, Hex
Barium
Arsenic
Copper, Free
Zinc
Conductivity (at 25°C)
Color
Chromium
Utility SOUTH TAHOE PUD - MAINPopulation served 100,000Owner 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
Copper Summary
Detected: 1.49 mg/L (ppm)
12/31/1992
Combined Uranium
Detected: 7.5 PCI/L
9/16/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Molybdenum, Total
Detected: 46 UG/L (ppb)
9/16/2025
Vanadium, Total
Detected: 3.4 UG/L (ppb)
9/16/2025
Iron
Detected: 31 UG/L (ppb)
9/16/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 12 UG/L (ppb)
9/16/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Chromium, Hex
Detected: 0.15 UG/L (ppb)
9/16/2025
Barium
Detected: 2.5 UG/L (ppb)
9/16/2025
Arsenic
Detected: 13 UG/L (ppb)
9/16/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Copper, Free
Detected: 13 UG/L (ppb)
8/13/2025
Zinc
Detected: 20 UG/L (ppb)
7/16/2025
Chromium
Detected: 2 UG/L (ppb)
7/8/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 2.06 MG/L (ppm)
9/16/2025
Sulfate
Detected: 7.22 MG/L (ppm)
9/16/2025
Fluoride
Detected: 0.28 MG/L (ppm)
9/16/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 0.02 MG/L (ppm)
9/16/2025
Nitrate
Detected: 0.02 MG/L (ppm)
9/16/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 0.23 MG/L (ppm)
9/16/2025
Potassium
Detected: 0.45 MG/L (ppm)
9/16/2025
Sodium
Detected: 18 MG/L (ppm)
9/16/2025
Calcium
Detected: 20.5 MG/L (ppm)
10/2/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Orthophosphate
Detected: 0.065 MG/L (ppm)
9/16/2025
Hardness, Total (ASCACO3)
Detected: 12.8 MG/L (ppm)
9/16/2025
pH, Field
Detected: 9.01 PH
10/2/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFHXA
Detected: 0.0163 µg/L (ppb)
3/12/2024
PFHPA
Detected: 0.0065 µg/L (ppb)
3/12/2024
PFPEA
Detected: 0.0224 µg/L (ppb)
3/12/2024
PFOA
Detected: 0.0061 µg/L (ppb)
3/12/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFBS
Detected: 0.0037 µg/L (ppb)
3/12/2024
PFOS
Detected: 0.0052 µg/L (ppb)
3/12/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXS
Detected: 0.0058 µg/L (ppb)
3/12/2024
PFBA
Detected: 0.0053 µg/L (ppb)
3/12/2024
Lithium
Detected: 26.3 µg/L (ppb)
2/13/2025
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Bromide
Detected: 0.0059 MG/L (ppm)
9/16/2025
Hexachlorobutadiene
Detected: 0.7 UG/L (ppb)
9/16/2025
1, 2, 3-Trichlorobenzene
Detected: 1.1 UG/L (ppb)
9/16/2025
Petroleum Compounds
Substances associated with fuel or petroleum contamination
Naphthalene
Detected: 2.6 UG/L (ppb)
9/16/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 55.6 MG/L (ppm)
10/2/2025
Alkalinity, Carbonate
Detected: 7.55 MG/L (ppm)
9/16/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 11.28 AGGR
10/2/2025
Temperature (CENTIGRADE)
Detected: 9.6 C
10/2/2025
Langelier Index (Source Temp.)
Detected: -0.76 LANG
10/2/2025
Alkalinity, Total
Detected: 55.6 MG/L (ppm)
10/2/2025
TDS
Detected: 205 MG/L (ppm)
10/2/2025
Turbidity
Detected: 0.2 NTU
9/16/2025
A measure of water cloudiness from suspended particles.
Radon
Detected: 5000 PCI/L
9/16/2025
Methylethylketone
Detected: 7 UG/L (ppb)
9/4/2025
Carbondioxide
Detected: 2670 UG/L (ppb)
9/10/2025
Conductivity (at 25°C)
Detected: 107 UMHO/CM
9/16/2025
Color
Detected: 5 UNITS
9/16/2025
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.