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EPA SDWIS ยท Solano County, California ยท 186 providers profiled

Solano County, CA Water Quality Report

Solano County is served by 186 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 Solano County, CA

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

Quick answer: Solano County has 186 water providers profiled, sorted by population served.

Violations on file

Coliform (TCR)
Older/archived health-based violation
Found at 10 of 186 providers
Nitrate
Older/archived health-based violation
Found at 1 of 186 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Surface Water Treatment Rule
Older/archived health-based violation
Found at 1 of 186 providers
Di(2-Ethylhexyl) Phthalate
Older/archived health-based violation
Found at 1 of 186 providers
Lead And Copper Rule Revisions
Currently open health violation
Found at 7 of 186 providers

Contaminants found

Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0235 mg/L (ppm)
Found at 54 providers
Copper Summary
Detected: 310 mg/L (ppm)
Found at 6 providers
Copper, Free
Detected: 660 UG/L (ppb)
Found at 14 providers
Chromium, Hex
Detected: 25 UG/L (ppb)
Found at 28 providers
Barium
Detected: 469 UG/L (ppb)
Found at 13 providers
Arsenic
Detected: 9 UG/L (ppb)
Found at 12 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: 32 UG/L (ppb)
Found at 8 providers
Occurs in two forms โ€” trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Selenium
Detected: 7.4 UG/L (ppb)
Found at 5 providers
Iron
Detected: 460 UG/L (ppb)
Found at 14 providers
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 290 UG/L (ppb)
Found at 10 providers
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Aluminum
Detected: 110 UG/L (ppb)
Found at 10 providers
Combined Uranium
Detected: 5.1 PCI/L
Found at 4 providers
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Vanadium, Total
Detected: 16 UG/L (ppb)
Found at 6 providers
Nickel
Detected: 2 UG/L (ppb)
Found at 3 providers
Zinc
Detected: 6.1 UG/L (ppb)
Found at 4 providers
Lead
Detected: 5.5 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.
Lithium, Total
Detected: 28 UG/L (ppb)
Found at 2 providers
Strontium
Detected: 570 UG/L (ppb)
Found at 2 providers
Antimony, Total
Detected: 2.1 UG/L (ppb)
5/5/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 87 UG/L (ppb)
Found at 23 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: 77 UG/L (ppb)
Found at 19 providers
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Totalhaloaceticacids (HAA5)
Detected: 47 UG/L (ppb)
Found at 16 providers
Bromodichloromethane
Detected: 14 UG/L (ppb)
Found at 20 providers
Dibromochloromethane
Detected: 5.4 UG/L (ppb)
Found at 20 providers
Bromoform
Detected: 3.63 UG/L (ppb)
Found at 12 providers
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 24 MG/L (ppm)
Found at 42 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Fluoride
Detected: 0.77 MG/L (ppm)
Found at 15 providers
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 12 MG/L (ppm)
Found at 6 providers
Chloride
Detected: 220 MG/L (ppm)
Found at 15 providers
Sulfate
Detected: 51 MG/L (ppm)
Found at 15 providers
Boron, Total
Detected: 520 UG/L (ppb)
5/20/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 62 MG/L (ppm)
Found at 15 providers
Sodium
Detected: 170 MG/L (ppm)
Found at 15 providers
Calcium
Detected: 48 MG/L (ppm)
Found at 16 providers
Potassium
Detected: 4 MG/L (ppm)
Found at 8 providers
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 0.84 LANG
Found at 13 providers
Hardness, Total (ASCACO3)
Detected: 380 MG/L (ppm)
Found at 14 providers
pH
Detected: 8.4 PH
Found at 12 providers
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Gross Alpha Particle Activity
Detected: 6.85 PCI/L
Found at 6 providers
Orthophosphate
Detected: 0.3 MG/L (ppm)
Found at 4 providers
pH, Field
Detected: 7.97 PH
Found at 7 providers
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFBS
Detected: 0.0037 ยตg/L (ppb)
Found at 2 providers
PFHXA
Detected: 0.0034 ยตg/L (ppb)
1/7/2025
PFBA
Detected: 0.0063 ยตg/L (ppb)
1/7/2025
Lithium
Detected: 40 ยตg/L (ppb)
Found at 6 providers
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFHXS
Detected: 0.0035 ยตg/L (ppb)
5/13/2024
PFOS
Detected: 0.01 ยตg/L (ppb)
5/8/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFOA
Detected: 0.0051 ยตg/L (ppb)
5/8/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 420 MG/L (ppm)
Found at 16 providers
Alkalinity, Carbonate
Detected: 6.2 MG/L (ppm)
Found at 7 providers
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 12.31 AGGR
Found at 14 providers
Alkalinity, Total
Detected: 420 MG/L (ppm)
Found at 16 providers
TDS
Detected: 840 MG/L (ppm)
Found at 16 providers
Turbidity
Detected: 5.8 NTU
Found at 15 providers
A measure of water cloudiness from suspended particles.
Odor
Detected: 4.5 TON
Found at 11 providers
Conductivity (at 25ยฐC)
Detected: 1200 UMHO/CM
Found at 16 providers
Color
Detected: 70 UNITS
Found at 12 providers
Radium-226
Detected: 0.41 PCI/L
8/6/2025
Dichloroaceticacid
Detected: 30 UG/L (ppb)
Found at 16 providers
Trichloroaceticacid
Detected: 17 UG/L (ppb)
Found at 15 providers
Carbon, Total
Detected: 4.4 MG/L (ppm)
Found at 6 providers
Temperature (CENTIGRADE)
Detected: 19.1 C
Found at 5 providers
Langelier Index (Source Temp.)
Detected: 0.24 LANG
Found at 5 providers
Metolachlor
Detected: 0.095 UG/L (ppb)
Found at 3 providers
Gross Beta Particle Activity
Detected: 2.05 PCI/L
10/9/2025
Dibromoaceticacid
Detected: 2.3 UG/L (ppb)
Found at 11 providers
Monochloroaceticacid
Detected: 3.1 UG/L (ppb)
Found at 5 providers
Nitrogen-Ammoniaas (N)
Detected: 0.062 MG/L (ppm)
Found at 2 providers
Perchlorate
Detected: 3.3 UG/L (ppb)
10/6/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Cyanide
Detected: 5.2 UG/L (ppb)
3/18/2025
Perfluorohexanoicacid (PFHXA)
Detected: 8 NG/L (ppt)
Found at 2 providers
Acetone
Detected: 14 UG/L (ppb)
5/7/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 4.9 NG/L (ppt)
7/15/2025
Perfluoroctanoicacid (PFOA)
Detected: 6.4 NG/L (ppt)
7/15/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorobutanoicacid (PFBA)
Detected: 2.6 NG/L (ppt)
7/15/2025
Perfluoropentanoicacid (PFPEA)
Detected: 8.1 NG/L (ppt)
7/15/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 1.8 NG/L (ppt)
4/8/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Radium-228
Detected: 0.84 PCI/L
8/6/2025
Combined Radium (-226 & -228)
Detected: 0.84 PCI/L
8/6/2025
A naturally occurring radioactive element found in some groundwater.
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
FluoridePartialYesPartial
Chromium, HexPartialYesPartial
BariumPartialYesPartial
Nitrate-NitritePartialYesPartial
ChromiumPartialYesPartial
SeleniumPartialYesPartial
Aggressive IndexPartialYesPartial
Alkalinity, TotalPartialYesPartial
TDSPartialYesPartial
ChloridePartialYesPartial
SulfatePartialYesPartial
OdorPartialYesPartial
IronPartialYesPartial
ManganesePartialYesPartial
AluminumPartialYesPartial
Conductivity (at 25ยฐC)PartialYesPartial
ColorPartialYesPartial
Radium-226PartialYesPartial
DichloroaceticacidPartialYesPartial
TrichloroaceticacidPartialYesPartial
Combined UraniumPartialYesPartial
PFBSPartialYes*Partial
PFHXAPartialYes*Partial
PFBAPartialYes*Partial
Carbon, TotalPartialYesPartial
Temperature (CENTIGRADE)PartialYesPartial
Langelier Index (Source Temp.)PartialYesPartial
Vanadium, TotalPartialYesPartial
MetolachlorPartialYesPartial
NickelPartialYesPartial
ZincPartialYesPartial
LithiumPartialYes*Partial
Gross Beta Particle ActivityPartialYesPartial
Lithium, TotalPartialYesPartial
StrontiumPartialYesPartial
DibromoaceticacidPartialYesPartial
MonochloroaceticacidPartialYesPartial
Nitrogen-Ammoniaas (N)PartialYesPartial
PFHXSPartialYes*Partial
Boron, TotalPartialYesPartial
PerchloratePartialYesPartial
Antimony, TotalPartialYesPartial
CyanidePartialYesPartial
Perfluorohexanoicacid (PFHXA)PartialYesPartial
AcetonePartialYesPartial
Perfluoroheptanoicacid (PFHPA)PartialYesPartial
Perfluoroctanoicacid (PFOA)PartialYesPartial
Perfluorobutanoicacid (PFBA)PartialYesPartial
Perfluoropentanoicacid (PFPEA)PartialYesPartial
Perfluoroctanesulfonicacid (PFOS)PartialYesPartial
Combined Radium (-226 & -228)PartialYesPartial
Coliform Bacteria (indicator)NoYesNo
Langelier Index (pH(s))NoNoNo
MagnesiumNoPartialNo
SodiumNoPartialNo
CalciumNoPartialNo
Alkalinity, BicarbonateNoNoNo
Alkalinity, CarbonateNoNoNo
Hardness, Total (ASCACO3)NoNoNo
pHNoNoNo
Gross Alpha Particle ActivityNoNoNo
PotassiumNoPartialNo
OrthophosphateNoNoNo
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?