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Water Quality Lookup / California / Sacramento County
EPA SDWIS ยท Sacramento County, California ยท 467 providers profiled

Sacramento County, CA Water Quality Report

Sacramento County is served by 467 major public water systems on file with the EPA.

Data current as of July 2026
๐Ÿ”Straight from EPA
๐ŸงชReal Lab Results
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Results for Sacramento County, CA

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

Quick answer: Sacramento County has 467 water providers profiled, sorted by population served.

Violations on file

Coliform (TCR)
Older/archived health-based violation
Found at 20 of 467 providers
Nitrate
Older/archived health-based violation
Found at 3 of 467 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Lead And Copper Rule Revisions
Currently open health violation
Found at 20 of 467 providers
Chlorine
Older/archived health-based violation
Found at 1 of 467 providers
Revised Total Coliform Rule
Currently open health violation
Found at 3 of 467 providers
Arsenic
Older/archived health-based violation
Found at 5 of 467 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.

Contaminants found

Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.544 mg/L (ppm)
Found at 109 providers
Copper Summary
Detected: 2.965 mg/L (ppm)
Found at 5 providers
Iron
Detected: 3500 UG/L (ppb)
Found at 30 providers
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 990 UG/L (ppb)
Found at 32 providers
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Arsenic
Detected: 67 UG/L (ppb)
Found at 45 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: 1300 UG/L (ppb)
Found at 39 providers
Lead
Detected: 77 UG/L (ppb)
Found at 16 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.
Chromium, Hex
Detected: 13 UG/L (ppb)
Found at 42 providers
Combined Uranium
Detected: 8.2 PCI/L
Found at 8 providers
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Barium
Detected: 260 UG/L (ppb)
Found at 23 providers
Aluminum
Detected: 370 UG/L (ppb)
Found at 4 providers
Chromium
Detected: 17 UG/L (ppb)
Found at 6 providers
Occurs in two forms โ€” trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Zinc
Detected: 140 UG/L (ppb)
Found at 3 providers
Nickel
Detected: 1.1 UG/L (ppb)
4/1/2025
Selenium
Detected: 3.9 UG/L (ppb)
5/5/2025
Vanadium, Total
Detected: 14 UG/L (ppb)
7/31/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 39.5 UG/L (ppb)
Found at 9 providers
TTHM
Detected: 76 UG/L (ppb)
Found at 16 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: 52 UG/L (ppb)
Found at 14 providers
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 4.6 UG/L (ppb)
Found at 9 providers
Dibromochloromethane
Detected: 3.5 UG/L (ppb)
Found at 5 providers
Bromoform
Detected: 3.6 UG/L (ppb)
Found at 2 providers
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 10 MG/L (ppm)
Found at 61 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Chloride
Detected: 68 MG/L (ppm)
Found at 36 providers
Sulfate
Detected: 75 MG/L (ppm)
Found at 32 providers
Fluoride
Detected: 0.7 MG/L (ppm)
Found at 15 providers
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 4.2 MG/L (ppm)
Found at 10 providers
Boron, Total
Detected: 240 UG/L (ppb)
Found at 2 providers
Nitrite
Detected: 0.26 MG/L (ppm)
7/17/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 31 MG/L (ppm)
Found at 32 providers
Calcium
Detected: 66 MG/L (ppm)
Found at 33 providers
Sodium
Detected: 190 MG/L (ppm)
Found at 32 providers
Potassium
Detected: 4.6 MG/L (ppm)
Found at 14 providers
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Gross Alpha Particle Activity
Detected: 11.5 PCI/L
Found at 20 providers
Langelier Index (pH(s))
Detected: 0.23 LANG
Found at 14 providers
Hardness, Total (ASCACO3)
Detected: 270 MG/L (ppm)
Found at 31 providers
pH
Detected: 8.6 PH
Found at 21 providers
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
pH, Field
Detected: 8.4 PH
Found at 13 providers
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 36 ยตg/L (ppb)
Found at 6 providers
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFBS
Detected: 0.0061 ยตg/L (ppb)
Found at 4 providers
PFHXS
Detected: 0.0191 ยตg/L (ppb)
Found at 10 providers
PFHXA
Detected: 0.0063 ยตg/L (ppb)
Found at 10 providers
PFPEA
Detected: 0.0065 ยตg/L (ppb)
Found at 11 providers
PFOS
Detected: 0.0414 ยตg/L (ppb)
Found at 9 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHPA
Detected: 0.0063 ยตg/L (ppb)
Found at 7 providers
PFOA
Detected: 0.0156 ยตg/L (ppb)
Found at 7 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFBA
Detected: 0.009 ยตg/L (ppb)
Found at 2 providers
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Tetrachloroethylene
Detected: 2.7 UG/L (ppb)
Found at 5 providers
Dichloromethane
Detected: 0.71 UG/L (ppb)
6/5/2025
Trichloroethylene
Detected: 1.1 UG/L (ppb)
Found at 5 providers
Ethylenedibromide
Detected: 0.012 UG/L (ppb)
6/10/2025
Dichlorodifluoromethane
Detected: 0.9 UG/L (ppb)
1/15/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 380 MG/L (ppm)
Found at 32 providers
Alkalinity, Carbonate
Detected: 20 MG/L (ppm)
Found at 2 providers
Other
Additional substances tested that don't fit neatly into the categories above
Perfluorohexanoicacid (PFHXA)
Detected: 17.4 NG/L (ppt)
Found at 17 providers
Aggressive Index
Detected: 12.3 AGGR
Found at 19 providers
Alkalinity, Total
Detected: 310 MG/L (ppm)
Found at 33 providers
TDS
Detected: 610 MG/L (ppm)
Found at 36 providers
Adsorbableorganicfluorine
Detected: 3900 NG/L (ppt)
Found at 4 providers
Odor
Detected: 70 TON
Found at 29 providers
Conductivity (at 25ยฐC)
Detected: 870 UMHO/CM
Found at 38 providers
Perfluoroctanoicacid (PFOA)
Detected: 15 NG/L (ppt)
Found at 15 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroheptanoicacid (PFHPA)
Detected: 8.2 NG/L (ppt)
Found at 12 providers
Perfluorohexanesulfonicacid (PFHxS)
Detected: 36 NG/L (ppt)
Found at 16 providers
Perfluoroctanesulfonicacid (PFOS)
Detected: 62 NG/L (ppt)
Found at 14 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoropentanoicacid (PFPEA)
Detected: 16 NG/L (ppt)
Found at 14 providers
Dichloroaceticacid
Detected: 18.2 UG/L (ppb)
Found at 9 providers
Trichloroaceticacid
Detected: 21.3 UG/L (ppb)
Found at 9 providers
Perfluorobutanesulfonicacid (PFBS)
Detected: 8.3 NG/L (ppt)
Found at 12 providers
Radium-228
Detected: 1.59 PCI/L
Found at 19 providers
Perchlorate
Detected: 40 UG/L (ppb)
Found at 8 providers
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Turbidity
Detected: 120 NTU
Found at 26 providers
A measure of water cloudiness from suspended particles.
Carbon, Total
Detected: 1.3 MG/L (ppm)
Found at 6 providers
Color
Detected: 22 UNITS
Found at 10 providers
Monochloroaceticacid
Detected: 2.1 UG/L (ppb)
Found at 2 providers
Silica
Detected: 85 MG/L (ppm)
Found at 3 providers
Perfluoropentanesulfonicacid (PFPES)
Detected: 6.8 NG/L (ppt)
Found at 2 providers
Perfluorobutanoicacid (PFBA)
Detected: 12 NG/L (ppt)
Found at 11 providers
Radium-226
Detected: 0.95 PCI/L
Found at 5 providers
Gross Beta Particle Activity
Detected: 3.5 PCI/L
4/10/2025
Combined Radium (-226 & -228)
Detected: 1.23 PCI/L
Found at 6 providers
A naturally occurring radioactive element found in some groundwater.
1, 4-Dioxane
Detected: 0.2 UG/L (ppb)
10/21/2025
Hexachlorocyclopentadiene
Detected: 0.048 UG/L (ppb)
8/26/2025
Foamingagents (SURFACTANTS)
Detected: 0.065 MG/L (ppm)
Found at 4 providers
Perfluorononanoicacid (PFNA)
Detected: 3.7 NG/L (ppt)
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
DichloromethaneYesYesYes
EthylenedibromideYesYesYes
DichlorodifluoromethaneYesYesYes
LeadPartialYesPartial
ArsenicPartialYesPartial
Chromium-6 (Hexavalent)PartialYesPartial
CopperPartialYesPartial
Combined UraniumPartialYesPartial
PFOAPartialYes*Partial
PFOSPartialYes*Partial
NitratePartialYesPartial
Combined RadiumPartialYesPartial
Perfluorohexanoicacid (PFHXA)PartialYesPartial
IronPartialYesPartial
ManganesePartialYesPartial
Copper, FreePartialYesPartial
Chromium, HexPartialYesPartial
Aggressive IndexPartialYesPartial
Alkalinity, TotalPartialYesPartial
TDSPartialYesPartial
ChloridePartialYesPartial
SulfatePartialYesPartial
FluoridePartialYesPartial
AdsorbableorganicfluorinePartialYesPartial
OdorPartialYesPartial
Conductivity (at 25ยฐC)PartialYesPartial
Perfluoroctanoicacid (PFOA)PartialYesPartial
Perfluoroheptanoicacid (PFHPA)PartialYesPartial
Perfluorohexanesulfonicacid (PFHxS)PartialYesPartial
Perfluoroctanesulfonicacid (PFOS)PartialYesPartial
Perfluoropentanoicacid (PFPEA)PartialYesPartial
DichloroaceticacidPartialYesPartial
TrichloroaceticacidPartialYesPartial
LithiumPartialYes*Partial
PFBSPartialYes*Partial
PFHXSPartialYes*Partial
PFHXAPartialYes*Partial
PFPEAPartialYes*Partial
Nitrate-NitritePartialYesPartial
Perfluorobutanesulfonicacid (PFBS)PartialYesPartial
Combined UraniumPartialYesPartial
PerchloratePartialYesPartial
BariumPartialYesPartial
AluminumPartialYesPartial
Carbon, TotalPartialYesPartial
ColorPartialYesPartial
MonochloroaceticacidPartialYesPartial
PFHPAPartialYes*Partial
PFBAPartialYes*Partial
SilicaPartialYesPartial
Perfluoropentanesulfonicacid (PFPES)PartialYesPartial
Perfluorobutanoicacid (PFBA)PartialYesPartial
Radium-226PartialYesPartial
Gross Beta Particle ActivityPartialYesPartial
Combined Radium (-226 & -228)PartialYesPartial
1, 4-DioxanePartialYesPartial
ChromiumPartialYesPartial
ZincPartialYesPartial
HexachlorocyclopentadienePartialYesPartial
Foamingagents (SURFACTANTS)PartialYesPartial
Perfluorononanoicacid (PFNA)PartialYesPartial
NickelPartialYesPartial
Boron, TotalPartialYesPartial
SeleniumPartialYesPartial
Vanadium, TotalPartialYesPartial
NitritePartialYesPartial
Coliform Bacteria (indicator)NoYesNo
Gross Alpha Particle ActivityNoNoNo
Langelier Index (pH(s))NoNoNo
MagnesiumNoPartialNo
CalciumNoPartialNo
SodiumNoPartialNo
Alkalinity, BicarbonateNoNoNo
Alkalinity, CarbonateNoNoNo
Hardness, Total (ASCACO3)NoNoNo
pHNoNoNo
PotassiumNoPartialNo
pH, FieldNoNoNo

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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?