EPA SDWIS ยท El Dorado County, California ยท 303 providers profiled
El Dorado County, CA Water Quality Report
El Dorado County is served by 303 major public water systems on file with the EPA.
Data current as of July 2026
๐Straight from EPA
๐งชReal Lab Results
๐ Updated Quarterly
๐ Local Expertise
Results for El Dorado County, CA
303 water providers on file for this county, sorted by population served.
Quick answer: El Dorado County has 303 water providers profiled, sorted by population served.
Lead Summary
PFPEA
pH, Field
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dichloroaceticacid
Trichloroaceticacid
Monochloroaceticacid
Odor
Nitrate-Nitrite
Nitrate
Aluminum
Copper Summary
PFHXA
PFHPA
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
Turbidity
Radon
Combined Uranium
Molybdenum, Total
Vanadium, Total
Hexachlorobutadiene
Naphthalene
1, 2, 3-Trichlorobenzene
Methylethylketone
Carbondioxide
Iron
Manganese
Chromium, Hex
Barium
Arsenic
Copper, Free
Zinc
Conductivity (at 25ยฐC)
Color
Chromium
Carbon, Total
Xylene, Metaandpara
Tetrachloroethylene
Trichloroethylene
Cis-1, 2-Dichloroethylene
Xylenes, Total
Perfluorohexanoicacid (PFHXA)
Perfluoropentanoicacid (PFPEA)
Radium-228
Radium-226
Combined Radium (-226 & -228)
Gross Alpha Particle Activity
Gross Beta Particle Activity
Perfluorobutanesulfonicacid (PFBS)
Perfluoroheptanoicacid (PFHPA)
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorobutanoicacid (PFBA)
Lead
pH
Dibromochloromethane
Dibromoaceticacid
Adsorbableorganicfluorine
Nitrite
Violations on file
Total Haloacetic Acids (HAA5)
Older/archived health-based violation
Found at 1 of 303 providers
Coliform (TCR)
Older/archived health-based violation
Found at 15 of 303 providers
Tetrachloroethylene
Older/archived health-based violation
Found at 1 of 303 providers
Lead And Copper Rule Revisions
Currently open health violation
Found at 3 of 303 providers
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.012 mg/L (ppm)
Found at 30 providers
Aluminum
Detected: 80 UG/L (ppb)
5/6/2025
Copper Summary
Detected: 4.25 mg/L (ppm)
Found at 6 providers
Combined Uranium
Detected: 41 PCI/L
Found at 3 providers
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: 11 UG/L (ppb)
Found at 4 providers
Iron
Detected: 1800 UG/L (ppb)
Found at 2 providers
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 1100 UG/L (ppb)
Found at 2 providers
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Chromium, Hex
Detected: 1.5 UG/L (ppb)
Found at 14 providers
Barium
Detected: 110 UG/L (ppb)
Found at 3 providers
Arsenic
Detected: 13 UG/L (ppb)
Found at 4 providers
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: 4760 UG/L (ppb)
Found at 7 providers
Zinc
Detected: 320 UG/L (ppb)
Found at 2 providers
Chromium
Detected: 2 UG/L (ppb)
Found at 2 providers
Occurs in two forms โ trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Lead
Detected: 8.5 UG/L (ppb)
Found at 3 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.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 39 UG/L (ppb)
Found at 4 providers
TTHM
Detected: 33 UG/L (ppb)
Found at 4 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: 31 UG/L (ppb)
Found at 4 providers
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 8.63 UG/L (ppb)
Found at 4 providers
Dibromochloromethane
Detected: 3.79 UG/L (ppb)
6/12/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate-Nitrite
Detected: 3.24 MG/L (ppm)
Found at 25 providers
Nitrate
Detected: 7.88 MG/L (ppm)
Found at 45 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Chloride
Detected: 21.5 MG/L (ppm)
Found at 5 providers
Sulfate
Detected: 110 MG/L (ppm)
Found at 3 providers
Fluoride
Detected: 0.28 MG/L (ppm)
Found at 2 providers
Often added deliberately for dental health; can also occur naturally.
Nitrite
Detected: 0.23 MG/L (ppm)
4/16/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 34.5 MG/L (ppm)
Found at 5 providers
Potassium
Detected: 4 MG/L (ppm)
Found at 2 providers
Sodium
Detected: 18 MG/L (ppm)
Found at 5 providers
Calcium
Detected: 82 MG/L (ppm)
Found at 5 providers
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
pH, Field
Detected: 9.01 PH
Found at 4 providers
Orthophosphate
Detected: 0.065 MG/L (ppm)
9/16/2025
Hardness, Total (ASCACO3)
Detected: 289 MG/L (ppm)
Found at 4 providers
Gross Alpha Particle Activity
Detected: 47 PCI/L
Found at 6 providers
pH
Detected: 7.27 PH
Found at 4 providers
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
PFPEA
Detected: 0.0224 ยตg/L (ppb)
Found at 2 providers
PFHXA
Detected: 0.0163 ยตg/L (ppb)
3/12/2024
PFHPA
Detected: 0.0065 ยตg/L (ppb)
3/12/2024
PFOA
Detected: 0.0061 ยตg/L (ppb)
Found at 2 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFBS
Detected: 0.0037 ยตg/L (ppb)
Found at 2 providers
PFOS
Detected: 0.0052 ยตg/L (ppb)
3/12/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXS
Detected: 0.0058 ยตg/L (ppb)
3/12/2024
PFBA
Detected: 0.0053 ยตg/L (ppb)
3/12/2024
Lithium
Detected: 26.3 ยตg/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
Tetrachloroethylene
Detected: 23 UG/L (ppb)
Found at 2 providers
Trichloroethylene
Detected: 0.7 UG/L (ppb)
10/7/2025
Cis-1, 2-Dichloroethylene
Detected: 1.6 UG/L (ppb)
10/7/2025
Petroleum Compounds
Substances associated with fuel or petroleum contamination
Naphthalene
Detected: 2.6 UG/L (ppb)
9/16/2025
Xylene, Metaandpara
Detected: 0.61 UG/L (ppb)
7/7/2025
Xylenes, Total
Detected: 0.61 UG/L (ppb)
7/7/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 239 MG/L (ppm)
Found at 5 providers
Alkalinity, Carbonate
Detected: 7.55 MG/L (ppm)
9/16/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 15 UG/L (ppb)
Found at 4 providers
Trichloroaceticacid
Detected: 21 UG/L (ppb)
Found at 4 providers
Monochloroaceticacid
Detected: 4.2 UG/L (ppb)
Found at 2 providers
Odor
Detected: 2.8 TON
Found at 4 providers
Aggressive Index
Detected: 11.76 AGGR
Found at 2 providers
Temperature (CENTIGRADE)
Detected: 9.6 C
10/2/2025
Langelier Index (Source Temp.)
Detected: -0.76 LANG
10/2/2025
Alkalinity, Total
Detected: 239 MG/L (ppm)
Found at 5 providers
TDS
Detected: 380 MG/L (ppm)
Found at 4 providers
Turbidity
Detected: 10 NTU
Found at 4 providers
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 25ยฐC)
Detected: 562 UMHO/CM
Found at 6 providers
Color
Detected: 15 UNITS
Found at 2 providers
Carbon, Total
Detected: 0.74 MG/L (ppm)
Found at 2 providers
Perfluorohexanoicacid (PFHXA)
Detected: 13 NG/L (ppt)
Found at 2 providers
Perfluoropentanoicacid (PFPEA)
Detected: 11 NG/L (ppt)
Found at 2 providers
Radium-228
Detected: 1.24 PCI/L
Found at 5 providers
Radium-226
Detected: 0.816 PCI/L
Found at 2 providers
Combined Radium (-226 & -228)
Detected: 0.981 PCI/L
Found at 3 providers
A naturally occurring radioactive element found in some groundwater.
Gross Beta Particle Activity
Detected: 14.3 PCI/L
Found at 2 providers
Perfluorobutanesulfonicacid (PFBS)
Detected: 8 NG/L (ppt)
6/16/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 5.7 NG/L (ppt)
6/16/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 4.3 NG/L (ppt)
6/16/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 2.3 NG/L (ppt)
6/16/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 13 NG/L (ppt)
6/16/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorobutanoicacid (PFBA)
Detected: 2.7 NG/L (ppt)
6/16/2025
Dibromoaceticacid
Detected: 2.1 UG/L (ppb)
6/12/2025
Adsorbableorganicfluorine
Detected: 9300 NG/L (ppt)
4/7/2025
Filtration considerations: General system types, not a specific product recommendation.