EPA SDWIS ยท Plumas County, California ยท 246 providers profiled
Plumas County, CA Water Quality Report
Plumas County is served by 246 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 Plumas County, CA
246 water providers on file for this county, sorted by population served.
Quick answer: Plumas County has 246 water providers profiled, sorted by population served.
Nitrate
Lead Summary
Copper, Free
Iron
Manganese
Aggressive Index
Langelier Index (pH(s))
Magnesium
Potassium
Sodium
Hardness, Total (ASCACO3)
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Sulfate
Chloride
Turbidity
pH, Field
Arsenic
Chromium
Zinc
Conductivity (at 25ยฐC)
Color
TTHM
Chloroform
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Chromium, Hex
Lead
Radium-228
Copper Summary
Gross Alpha Particle Activity
Nitrate-Nitrite
Bromodichloromethane
Adsorbableorganicfluorine
Combined Uranium
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
pH
Totalhaloaceticacids (HAA5)
Monochloroaceticacid
PFPEA
Fluoride
Violations on file
Coliform (TCR)
Older/archived health-based violation
Found at 6 of 246 providers
Lead And Copper Rule Revisions
Currently open health violation
Found at 11 of 246 providers
Combined Uranium
Older/archived health-based violation
Found at 1 of 246 providers
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.013 mg/L (ppm)
Found at 43 providers
Copper, Free
Detected: 228 UG/L (ppb)
Found at 5 providers
Iron
Detected: 1200 UG/L (ppb)
Found at 4 providers
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 524 UG/L (ppb)
Found at 3 providers
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Arsenic
Detected: 19 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.
Chromium
Detected: 10 UG/L (ppb)
4/8/2025
Occurs in two forms โ trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Zinc
Detected: 30 UG/L (ppb)
4/8/2025
Chromium, Hex
Detected: 1.5 UG/L (ppb)
Found at 9 providers
Lead
Detected: 4.55 UG/L (ppb)
9/10/2025
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 Summary
Detected: 2.5 mg/L (ppm)
Found at 3 providers
Combined Uranium
Detected: 15.3 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.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 31.4 UG/L (ppb)
Found at 5 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: 29 UG/L (ppb)
Found at 5 providers
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Dibromochloromethane
Detected: 1 UG/L (ppb)
Found at 2 providers
Bromodichloromethane
Detected: 2.4 UG/L (ppb)
Found at 3 providers
Totalhaloaceticacids (HAA5)
Detected: 32 UG/L (ppb)
Found at 2 providers
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 2.5 MG/L (ppm)
Found at 29 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Sulfate
Detected: 143 MG/L (ppm)
4/8/2025
Chloride
Detected: 9.6 MG/L (ppm)
Found at 2 providers
Nitrate-Nitrite
Detected: 0.8 MG/L (ppm)
8/14/2025
Fluoride
Detected: 0.1 MG/L (ppm)
5/19/2025
Often added deliberately for dental health; can also occur naturally.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 17 MG/L (ppm)
Found at 2 providers
Potassium
Detected: 2 MG/L (ppm)
4/8/2025
Sodium
Detected: 14 MG/L (ppm)
4/8/2025
Calcium
Detected: 67 MG/L (ppm)
Found at 2 providers
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: -0.2 LANG
4/8/2025
Hardness, Total (ASCACO3)
Detected: 237 MG/L (ppm)
Found at 2 providers
pH, Field
Detected: 7.58 PH
Found at 2 providers
Gross Alpha Particle Activity
Detected: 35.7 PCI/L
Found at 4 providers
pH
Detected: 5.84 PH
6/10/2025
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
PFPEA
Detected: 0.0038 ยตg/L (ppb)
11/6/2024
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 180 MG/L (ppm)
Found at 2 providers
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 11.7 AGGR
4/8/2025
Alkalinity, Total
Detected: 150 MG/L (ppm)
Found at 2 providers
TDS
Detected: 380 MG/L (ppm)
Found at 2 providers
Turbidity
Detected: 3.6 NTU
Found at 3 providers
A measure of water cloudiness from suspended particles.
Conductivity (at 25ยฐC)
Detected: 555 UMHO/CM
Found at 2 providers
Color
Detected: 13 UNITS
Found at 2 providers
Dichloroaceticacid
Detected: 14 UG/L (ppb)
Found at 4 providers
Trichloroaceticacid
Detected: 17 UG/L (ppb)
Found at 3 providers
Radium-228
Detected: 0.747 PCI/L
Found at 8 providers
Adsorbableorganicfluorine
Detected: 800 NG/L (ppt)
5/13/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 2.2 NG/L (ppt)
9/29/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 2.7 NG/L (ppt)
9/29/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Monochloroaceticacid
Detected: 2 UG/L (ppb)
Found at 2 providers
Filtration considerations: General system types, not a specific product recommendation.