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EPA SDWIS ยท Shasta County, California ยท 401 providers profiled

Shasta County, CA Water Quality Report

Shasta County is served by 401 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
๐Ÿ Local Expertise
Results for Shasta County, CA

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

Quick answer: Shasta County has 401 water providers profiled, sorted by population served.

Violations on file

Antimony, Total
Older/archived health-based violation
Found at 1 of 401 providers
Coliform (TCR)
Older/archived health-based violation
Found at 2 of 401 providers
Lead And Copper Rule Revisions
Currently open health violation
Found at 41 of 401 providers
Nitrate
Older/archived health-based violation
Found at 1 of 401 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Selenium
Older/archived health-based violation
Found at 1 of 401 providers

Contaminants found

Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0153 mg/L (ppm)
Found at 103 providers
Copper, Free
Detected: 1230 UG/L (ppb)
Found at 38 providers
Chromium, Hex
Detected: 11 UG/L (ppb)
Found at 39 providers
Lead
Detected: 21.4 UG/L (ppb)
Found at 22 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.
Iron
Detected: 1690 UG/L (ppb)
Found at 9 providers
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 450 UG/L (ppb)
Found at 13 providers
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Barium
Detected: 253 UG/L (ppb)
Found at 17 providers
Aluminum
Detected: 330 UG/L (ppb)
Found at 8 providers
Zinc
Detected: 370 UG/L (ppb)
Found at 12 providers
Copper Summary
Detected: 111.9 mg/L (ppm)
Found at 18 providers
Nickel
Detected: 2.37 UG/L (ppb)
Found at 6 providers
Chromium
Detected: 12 UG/L (ppb)
Found at 3 providers
Occurs in two forms โ€” trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Arsenic
Detected: 6.97 UG/L (ppb)
Found at 3 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.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 40.3 UG/L (ppb)
Found at 19 providers
TTHM
Detected: 59 UG/L (ppb)
Found at 21 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: 55 UG/L (ppb)
Found at 24 providers
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 17 UG/L (ppb)
Found at 6 providers
Bromodichloromethane
Detected: 9.5 UG/L (ppb)
Found at 23 providers
Dibromochloromethane
Detected: 20 UG/L (ppb)
Found at 14 providers
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 3.63 MG/L (ppm)
Found at 121 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Chloride
Detected: 13.9 MG/L (ppm)
Found at 14 providers
Sulfate
Detected: 25.8 MG/L (ppm)
Found at 13 providers
Nitrite
Detected: 0.27 MG/L (ppm)
6/20/2025
Fluoride
Detected: 0.19 MG/L (ppm)
Found at 6 providers
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 0.9 MG/L (ppm)
3/19/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 11.7 MG/L (ppm)
Found at 9 providers
Sodium
Detected: 18.2 MG/L (ppm)
Found at 8 providers
Calcium
Detected: 20 MG/L (ppm)
Found at 8 providers
Potassium
Detected: 1.1 MG/L (ppm)
Found at 2 providers
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
pH
Detected: 7.86 PH
Found at 11 providers
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Hardness, Total (ASCACO3)
Detected: 95 MG/L (ppm)
Found at 7 providers
Langelier Index (pH(s))
Detected: -1.5 LANG
Found at 2 providers
pH, Field
Detected: 6.77 PH
Found at 2 providers
Gross Alpha Particle Activity
Detected: 0.74 PCI/L
5/27/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFOS
Detected: 0.0095 ยตg/L (ppb)
9/27/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXA
Detected: 0.0057 ยตg/L (ppb)
9/27/2023
PFOA
Detected: 0.012 ยตg/L (ppb)
9/27/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFPEA
Detected: 0.0054 ยตg/L (ppb)
9/27/2023
PFHXS
Detected: 0.0056 ยตg/L (ppb)
9/27/2023
PFHPA
Detected: 0.0041 ยตg/L (ppb)
9/27/2023
PFBS
Detected: 0.0089 ยตg/L (ppb)
9/27/2023
Lithium
Detected: 36 ยตg/L (ppb)
Found at 2 providers
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: 130 MG/L (ppm)
Found at 8 providers
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 17 UG/L (ppb)
Found at 19 providers
Dibromoaceticacid
Detected: 7.9 UG/L (ppb)
Found at 2 providers
TDS
Detected: 232 MG/L (ppm)
Found at 14 providers
Turbidity
Detected: 8.6 NTU
Found at 8 providers
A measure of water cloudiness from suspended particles.
Radium-228
Detected: 0.978 PCI/L
Found at 5 providers
Conductivity (at 25ยฐC)
Detected: 327 UMHO/CM
Found at 13 providers
Perfluoroctanoicacid (PFOA)
Detected: 12 NG/L (ppt)
Found at 8 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoropentanoicacid (PFPEA)
Detected: 8.9 NG/L (ppt)
Found at 6 providers
Perfluorobutanesulfonicacid (PFBS)
Detected: 6.9 NG/L (ppt)
Found at 6 providers
Perfluoroheptanoicacid (PFHPA)
Detected: 2.9 NG/L (ppt)
Found at 3 providers
Perfluorohexanesulfonicacid (PFHxS)
Detected: 12.1 NG/L (ppt)
Found at 5 providers
Perfluoroctanesulfonicacid (PFOS)
Detected: 14 NG/L (ppt)
Found at 7 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 7.6 NG/L (ppt)
Found at 3 providers
Trichloroaceticacid
Detected: 40.3 UG/L (ppb)
Found at 16 providers
Aggressive Index
Detected: 10.5 AGGR
Found at 3 providers
Alkalinity, Total
Detected: 110 MG/L (ppm)
Found at 8 providers
Perfluorooctanesulfonicacid6:2fts
Detected: 1.8 NG/L (ppt)
1/27/2025
Perfluoropentanesulfonicacid (PFPES)
Detected: 2.5 NG/L (ppt)
7/24/2025
Perfluorobutanoicacid (PFBA)
Detected: 3.6 NG/L (ppt)
Found at 2 providers
Odor
Detected: 3 TON
2/10/2025
Color
Detected: 7 UNITS
Found at 2 providers
Methyltert-Butylether
Detected: 9.5 UG/L (ppb)
10/2/2025
Monochloroaceticacid
Detected: 1.8 UG/L (ppb)
Found at 2 providers
Carbon, Total
Detected: 1.1 MG/L (ppm)
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
Totalhaloaceticacids (HAA5)YesYesYes
LeadPartialYesPartial
ArsenicPartialYesPartial
Chromium-6 (Hexavalent)PartialYesPartial
CopperPartialYesPartial
Combined UraniumPartialYesPartial
PFOAPartialYes*Partial
PFOSPartialYes*Partial
NitratePartialYesPartial
Combined RadiumPartialYesPartial
Copper, FreePartialYesPartial
Chromium, HexPartialYesPartial
DichloroaceticacidPartialYesPartial
DibromoaceticacidPartialYesPartial
TDSPartialYesPartial
ChloridePartialYesPartial
SulfatePartialYesPartial
IronPartialYesPartial
ManganesePartialYesPartial
BariumPartialYesPartial
AluminumPartialYesPartial
ZincPartialYesPartial
Conductivity (at 25ยฐC)PartialYesPartial
NickelPartialYesPartial
Perfluoroctanoicacid (PFOA)PartialYesPartial
Perfluoropentanoicacid (PFPEA)PartialYesPartial
NitritePartialYesPartial
ChromiumPartialYesPartial
Perfluorobutanesulfonicacid (PFBS)PartialYesPartial
Perfluoroheptanoicacid (PFHPA)PartialYesPartial
Perfluorohexanesulfonicacid (PFHxS)PartialYesPartial
Perfluoroctanesulfonicacid (PFOS)PartialYesPartial
Perfluorohexanoicacid (PFHXA)PartialYesPartial
TrichloroaceticacidPartialYesPartial
FluoridePartialYesPartial
Aggressive IndexPartialYesPartial
Alkalinity, TotalPartialYesPartial
Nitrate-NitritePartialYesPartial
Perfluorooctanesulfonicacid6:2ftsPartialYesPartial
Perfluoropentanesulfonicacid (PFPES)PartialYesPartial
Perfluorobutanoicacid (PFBA)PartialYesPartial
OdorPartialYesPartial
ColorPartialYesPartial
Methyltert-ButyletherPartialYesPartial
MonochloroaceticacidPartialYesPartial
PFHXAPartialYes*Partial
PFPEAPartialYes*Partial
PFHXSPartialYes*Partial
PFHPAPartialYes*Partial
PFBSPartialYes*Partial
LithiumPartialYes*Partial
Carbon, TotalPartialYesPartial
Coliform Bacteria (indicator)NoYesNo
pHNoNoNo
MagnesiumNoPartialNo
SodiumNoPartialNo
Hardness, Total (ASCACO3)NoNoNo
Langelier Index (pH(s))NoNoNo
CalciumNoPartialNo
Alkalinity, BicarbonateNoNoNo
pH, FieldNoNoNo
Gross Alpha Particle ActivityNoNoNo
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?