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EPA SDWIS ยท Butte County, California ยท 160 providers profiled

Butte County, CA Water Quality Report

Butte County is served by 160 major public water systems on file with the EPA.

Data current as of July 2026
๐Ÿ”Straight from EPA
๐ŸงชReal Lab Results
๐Ÿ“…Updated Quarterly
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Results for Butte County, CA

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

Quick answer: Butte County has 160 water providers profiled, sorted by population served.

Violations on file

Nitrate
Older/archived health-based violation
Found at 4 of 160 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Arsenic
Older/archived health-based violation
Found at 2 of 160 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.
Lead And Copper Rule Revisions
Currently open health violation
Found at 26 of 160 providers
Revised Total Coliform Rule
Older/archived health-based violation
Found at 1 of 160 providers

Contaminants found

Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.055 mg/L (ppm)
Found at 82 providers
Copper Summary
Detected: 4.185 mg/L (ppm)
Found at 8 providers
Lead
Detected: 27 UG/L (ppb)
Found at 9 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: 1610 UG/L (ppb)
Found at 20 providers
Chromium, Hex
Detected: 11.1 UG/L (ppb)
Found at 35 providers
Manganese
Detected: 170 UG/L (ppb)
Found at 6 providers
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Iron
Detected: 6020 UG/L (ppb)
Found at 4 providers
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Arsenic
Detected: 14.1 UG/L (ppb)
Found at 5 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: 5.2 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).
Barium
Detected: 18.8 UG/L (ppb)
Found at 3 providers
Aluminum
Detected: 57.6 UG/L (ppb)
9/22/2025
Zinc
Detected: 138 UG/L (ppb)
9/22/2025
Strontium
Detected: 55 UG/L (ppb)
8/13/2025
Vanadium, Total
Detected: 3.1 UG/L (ppb)
6/25/2025
Nickel
Detected: 1.4 UG/L (ppb)
6/25/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Bromodichloromethane
Detected: 3 UG/L (ppb)
Found at 10 providers
Totalhaloaceticacids (HAA5)
Detected: 38 UG/L (ppb)
Found at 8 providers
TTHM
Detected: 51 UG/L (ppb)
Found at 9 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: 49 UG/L (ppb)
Found at 10 providers
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 3 UG/L (ppb)
Found at 3 providers
Dibromochloromethane
Detected: 1.1 UG/L (ppb)
Found at 5 providers
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 15.6 MG/L (ppm)
Found at 59 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Chloride
Detected: 9.5 MG/L (ppm)
Found at 4 providers
Nitrate-Nitrite
Detected: 0.9 MG/L (ppm)
Found at 3 providers
Sulfate
Detected: 6.9 MG/L (ppm)
Found at 3 providers
Nitrite
Detected: 0.35 MG/L (ppm)
5/20/2025
Fluoride
Detected: 0.8 MG/L (ppm)
Found at 2 providers
Often added deliberately for dental health; can also occur naturally.
Minerals
Everyday minerals that mainly affect taste and water hardness
Sodium
Detected: 13 MG/L (ppm)
Found at 3 providers
Calcium
Detected: 26.7 MG/L (ppm)
Found at 3 providers
Magnesium
Detected: 18 MG/L (ppm)
Found at 3 providers
Potassium
Detected: 1 MG/L (ppm)
7/9/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Gross Alpha Particle Activity
Detected: 3.57 PCI/L
Found at 6 providers
pH
Detected: 7.93 PH
Found at 3 providers
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Langelier Index (pH(s))
Detected: -0.86 LANG
Found at 3 providers
Hardness, Total (ASCACO3)
Detected: 128 MG/L (ppm)
Found at 3 providers
pH, Field
Detected: 7.5 PH
Found at 2 providers
Orthophosphate
Detected: 0.3 MG/L (ppm)
Found at 2 providers
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFOS
Detected: 0.009 ยตg/L (ppb)
Found at 3 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXS
Detected: 0.0123 ยตg/L (ppb)
Found at 2 providers
Lithium
Detected: 81.3 ยตg/L (ppb)
Found at 3 providers
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFBS
Detected: 0.003 ยตg/L (ppb)
6/19/2024
PFOA
Detected: 0.0068 ยตg/L (ppb)
4/9/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFPEA
Detected: 0.0062 ยตg/L (ppb)
Found at 2 providers
PFHXA
Detected: 0.006 ยตg/L (ppb)
Found at 2 providers
PFNA
Detected: 0.0096 ยตg/L (ppb)
12/2/2024
PFHPA
Detected: 0.0032 ยตg/L (ppb)
12/2/2024
PFBA
Detected: 0.0057 ยตg/L (ppb)
4/21/2025
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
1, 1-Dichloroethylene
Detected: 0.61 UG/L (ppb)
4/4/2025
1, 2, 3-Trichloropropane
Detected: 0.044 UG/L (ppb)
10/16/2025
Trichloroethylene
Detected: 1.1 UG/L (ppb)
10/24/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 133 MG/L (ppm)
Found at 4 providers
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 11.2 AGGR
Found at 3 providers
Temperature (CENTIGRADE)
Detected: 21.4 C
4/22/2025
Alkalinity, Total
Detected: 133 MG/L (ppm)
Found at 4 providers
TDS
Detected: 200 MG/L (ppm)
Found at 4 providers
Turbidity
Detected: 2.3 NTU
Found at 2 providers
A measure of water cloudiness from suspended particles.
Radium-228
Detected: 0.764 PCI/L
Found at 7 providers
Conductivity (at 25ยฐC)
Detected: 263 UMHO/CM
Found at 3 providers
Perfluorobutanesulfonicacid (PFBS)
Detected: 5.1 NG/L (ppt)
Found at 6 providers
Perfluorohexanesulfonicacid (PFHxS)
Detected: 8.3 NG/L (ppt)
Found at 4 providers
Perfluoroctanesulfonicacid (PFOS)
Detected: 24 NG/L (ppt)
Found at 4 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoropentanesulfonicacid (PFPES)
Detected: 2.4 NG/L (ppt)
Found at 2 providers
Perfluorobutanoicacid (PFBA)
Detected: 6.3 NG/L (ppt)
Found at 3 providers
Perchlorate
Detected: 1.8 UG/L (ppb)
8/19/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Dichloroaceticacid
Detected: 15 UG/L (ppb)
Found at 8 providers
Trichloroaceticacid
Detected: 23 UG/L (ppb)
Found at 8 providers
Perfluoroctanoicacid (PFOA)
Detected: 4.8 NG/L (ppt)
Found at 3 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 3.3 NG/L (ppt)
Found at 2 providers
Perfluoroheptanoicacid (PFHPA)
Detected: 2 NG/L (ppt)
10/21/2025
Perfluoropentanoicacid (PFPEA)
Detected: 3.9 NG/L (ppt)
10/21/2025
Carbon, Total
Detected: 1.6 MG/L (ppm)
Found at 4 providers
4-Methyl-2-Pentanone
Detected: 1.6 UG/L (ppb)
2/3/2025
Monochloroaceticacid
Detected: 2 UG/L (ppb)
Found at 2 providers
Filtration considerations: General system types, not a specific product recommendation.
Contaminant Whole-House Carbon Under-Sink RO Under-Sink Carbon
Total Trihalomethanes (TTHM)YesYesYes
Haloacetic Acids (HAA5)YesYesYes
ChloroformYesYesYes
Chlorine / TasteYesYesYes
Sediment / TurbidityYesYesYes
TrichloroethyleneYesYesYes
TetrachloroethyleneYesYesYes
cis-1,2-DichloroethyleneYesYesYes
1,1-DichloroethyleneYesYesYes
BromoformYesYesYes
BromodichloromethaneYesYesYes
DibromochloromethaneYesYesYes
1,1,2-TrichloroethaneYesYesYes
Vinyl ChlorideYesYesYes
Carbon TetrachlorideYesYesYes
BenzeneYesYesYes
TolueneYesYesYes
XyleneYesYesYes
1, 2, 3-TrichloropropaneYesYesYes
Totalhaloaceticacids (HAA5)YesYesYes
LeadPartialYesPartial
ArsenicPartialYesPartial
Chromium-6 (Hexavalent)PartialYesPartial
CopperPartialYesPartial
Combined UraniumPartialYesPartial
PFOAPartialYes*Partial
PFOSPartialYes*Partial
NitratePartialYesPartial
Combined RadiumPartialYesPartial
Copper, FreePartialYesPartial
Chromium, HexPartialYesPartial
ManganesePartialYesPartial
IronPartialYesPartial
Aggressive IndexPartialYesPartial
Temperature (CENTIGRADE)PartialYesPartial
Alkalinity, TotalPartialYesPartial
TDSPartialYesPartial
ChloridePartialYesPartial
Nitrate-NitritePartialYesPartial
Conductivity (at 25ยฐC)PartialYesPartial
ChromiumPartialYesPartial
BariumPartialYesPartial
Perfluorobutanesulfonicacid (PFBS)PartialYesPartial
Perfluorohexanesulfonicacid (PFHxS)PartialYesPartial
Perfluoroctanesulfonicacid (PFOS)PartialYesPartial
Perfluoropentanesulfonicacid (PFPES)PartialYesPartial
Perfluorobutanoicacid (PFBA)PartialYesPartial
PerchloratePartialYesPartial
SulfatePartialYesPartial
AluminumPartialYesPartial
ZincPartialYesPartial
DichloroaceticacidPartialYesPartial
TrichloroaceticacidPartialYesPartial
NitritePartialYesPartial
PFHXSPartialYes*Partial
LithiumPartialYes*Partial
PFBSPartialYes*Partial
PFPEAPartialYes*Partial
PFHXAPartialYes*Partial
FluoridePartialYesPartial
Perfluoroctanoicacid (PFOA)PartialYesPartial
Perfluorohexanoicacid (PFHXA)PartialYesPartial
Perfluoroheptanoicacid (PFHPA)PartialYesPartial
Perfluoropentanoicacid (PFPEA)PartialYesPartial
PFNAPartialYes*Partial
PFHPAPartialYes*Partial
PFBAPartialYes*Partial
Carbon, TotalPartialYesPartial
StrontiumPartialYesPartial
4-Methyl-2-PentanonePartialYesPartial
Vanadium, TotalPartialYesPartial
NickelPartialYesPartial
MonochloroaceticacidPartialYesPartial
Coliform Bacteria (indicator)NoYesNo
Gross Alpha Particle ActivityNoNoNo
pHNoNoNo
Langelier Index (pH(s))NoNoNo
SodiumNoPartialNo
Hardness, Total (ASCACO3)NoNoNo
CalciumNoPartialNo
Alkalinity, BicarbonateNoNoNo
pH, FieldNoNoNo
MagnesiumNoPartialNo
OrthophosphateNoNoNo
PotassiumNoPartialNo

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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?