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EPA SDWIS Β· Tulare County, California Β· 713 providers profiled

Tulare County, CA Water Quality Report

Tulare County is served by 713 major public water systems on file with the EPA.

Data current as of July 2026
πŸ”Straight from EPA
πŸ§ͺReal Lab Results
πŸ“…Updated Quarterly
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Results for Tulare County, CA

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

Quick answer: Tulare County has 713 water providers profiled, sorted by population served.

Violations on file

Nitrate
Older/archived health-based violation
Found at 46 of 713 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Coliform (TCR)
Older/archived health-based violation
Found at 30 of 713 providers
Surface Water Treatment Rule
Older/archived health-based violation
Found at 3 of 713 providers
1, 2-Dibromo-3-Chloropropane
Older/archived health-based violation
Found at 3 of 713 providers
Lead And Copper Rule Revisions
Currently open health violation
Found at 50 of 713 providers
Combined Uranium
Older/archived health-based violation
Found at 2 of 713 providers
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Total Haloacetic Acids (HAA5)
Older/archived health-based violation
Found at 1 of 713 providers
TTHM
Older/archived health-based violation
Found at 1 of 713 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.
Nitrate-Nitrite
Older/archived health-based violation
Found at 1 of 713 providers
Arsenic
Older/archived health-based violation
Found at 5 of 713 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: 0.0905 mg/L (ppm)
Found at 216 providers
Copper Summary
Detected: 3.445 mg/L (ppm)
Found at 16 providers
Combined Uranium
Detected: 123 PCI/L
Found at 40 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: 53 UG/L (ppb)
Found at 2 providers
Chromium, Hex
Detected: 12 UG/L (ppb)
Found at 65 providers
Arsenic
Detected: 18 UG/L (ppb)
Found at 51 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.
Barium
Detected: 661 UG/L (ppb)
Found at 38 providers
Nickel
Detected: 42 UG/L (ppb)
Found at 4 providers
Aluminum
Detected: 1500 UG/L (ppb)
Found at 21 providers
Selenium
Detected: 4.8 UG/L (ppb)
Found at 5 providers
Copper, Free
Detected: 750 UG/L (ppb)
Found at 49 providers
Lead
Detected: 26 UG/L (ppb)
Found at 30 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
Detected: 37 UG/L (ppb)
Found at 8 providers
Occurs in two forms β€” trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Iron
Detected: 11000 UG/L (ppb)
Found at 38 providers
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 102 UG/L (ppb)
Found at 26 providers
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Strontium
Detected: 500 UG/L (ppb)
10/21/2025
Zinc
Detected: 1400 UG/L (ppb)
Found at 16 providers
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 83 UG/L (ppb)
Found at 45 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.
Bromoform
Detected: 27 UG/L (ppb)
Found at 31 providers
Bromodichloromethane
Detected: 19 UG/L (ppb)
Found at 34 providers
Dibromochloromethane
Detected: 21 UG/L (ppb)
Found at 38 providers
Totalhaloaceticacids (HAA5)
Detected: 53 UG/L (ppb)
Found at 21 providers
Chloroform
Detected: 70 UG/L (ppb)
Found at 28 providers
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 40 MG/L (ppm)
Found at 191 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Nitrate-Nitrite
Detected: 25 MG/L (ppm)
Found at 53 providers
Fluoride
Detected: 3.1 MG/L (ppm)
Found at 59 providers
Often added deliberately for dental health; can also occur naturally.
Chloride
Detected: 720 MG/L (ppm)
Found at 46 providers
Sulfate
Detected: 190 MG/L (ppm)
Found at 43 providers
Nitrite
Detected: 0.4 MG/L (ppm)
Found at 3 providers
Boron, Total
Detected: 300 UG/L (ppb)
Found at 4 providers
Minerals
Everyday minerals that mainly affect taste and water hardness
Sodium
Detected: 190 MG/L (ppm)
Found at 47 providers
Magnesium
Detected: 74 MG/L (ppm)
Found at 44 providers
Calcium
Detected: 105 MG/L (ppm)
Found at 47 providers
Potassium
Detected: 6 MG/L (ppm)
Found at 25 providers
Hydroxideascalciumcarbonate
Detected: 20 MG/L (ppm)
Found at 2 providers
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Gross Alpha Particle Activity
Detected: 23.7 PCI/L
Found at 48 providers
pH
Detected: 9.8 PH
Found at 33 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: 421 MG/L (ppm)
Found at 46 providers
Langelier Index (pH(s))
Detected: 1 LANG
Found at 36 providers
pH, Field
Detected: 8.6 PH
Found at 12 providers
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFOS
Detected: 0.011 Β΅g/L (ppb)
Found at 3 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFPEA
Detected: 0.034 Β΅g/L (ppb)
Found at 3 providers
PFBS
Detected: 0.0047 Β΅g/L (ppb)
Found at 3 providers
PFOA
Detected: 0.022 Β΅g/L (ppb)
Found at 3 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Lithium
Detected: 10.3 Β΅g/L (ppb)
11/20/2023
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFHXS
Detected: 0.0036 Β΅g/L (ppb)
11/20/2023
PFHXA
Detected: 0.015 Β΅g/L (ppb)
Found at 2 providers
PFHPA
Detected: 0.0065 Β΅g/L (ppb)
11/20/2023
PFBA
Detected: 0.028 Β΅g/L (ppb)
Found at 2 providers
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
1, 2, 3-Trichloropropane
Detected: 0.29 UG/L (ppb)
Found at 23 providers
1, 2-Dichloropropane
Detected: 0.5 UG/L (ppb)
10/16/2025
Tetrachloroethylene
Detected: 2.3 UG/L (ppb)
Found at 4 providers
1, 1-Dichloroethylene
Detected: 0.6 UG/L (ppb)
8/13/2025
Trichlorofluoromethane
Detected: 7.6 UG/L (ppb)
3/4/2025
Petroleum Compounds
Substances associated with fuel or petroleum contamination
Xylene, Metaandpara
Detected: 5.9 UG/L (ppb)
3/19/2025
O-Xylene
Detected: 6.1 UG/L (ppb)
3/19/2025
Toluene
Detected: 1.2 UG/L (ppb)
Found at 2 providers
Ethylbenzene
Detected: 1.1 UG/L (ppb)
3/19/2025
Xylenes, Total
Detected: 12 UG/L (ppb)
3/19/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 370 MG/L (ppm)
Found at 47 providers
Alkalinity, Carbonate
Detected: 25 MG/L (ppm)
Found at 6 providers
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 32 UG/L (ppb)
Found at 21 providers
Trichloroaceticacid
Detected: 45.4 UG/L (ppb)
Found at 13 providers
Dibromoaceticacid
Detected: 8 UG/L (ppb)
Found at 19 providers
Conductivity (at 25Β°C)
Detected: 2600 UMHO/CM
Found at 70 providers
Perchlorate
Detected: 11 UG/L (ppb)
Found at 10 providers
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
TDS
Detected: 1500 MG/L (ppm)
Found at 46 providers
Radium-228
Detected: 1.77 PCI/L
Found at 28 providers
Odor
Detected: 128 TON
Found at 8 providers
Color
Detected: 25 UNITS
Found at 18 providers
1, 2-Dibromo-3-Chloropropane
Detected: 0.18 UG/L (ppb)
Found at 13 providers
Alkalinity, Total
Detected: 300 MG/L (ppm)
Found at 49 providers
Atrazine
Detected: 0.051 UG/L (ppb)
3/25/2025
Perfluoroctanoicacid (PFOA)
Detected: 8.4 NG/L (ppt)
Found at 7 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Turbidity
Detected: 5.6 NTU
Found at 30 providers
A measure of water cloudiness from suspended particles.
Perfluorobutanesulfonicacid (PFBS)
Detected: 4.5 NG/L (ppt)
Found at 7 providers
Perfluoroheptanoicacid (PFHPA)
Detected: 5 NG/L (ppt)
Found at 4 providers
Perfluoroctanesulfonicacid (PFOS)
Detected: 9.5 NG/L (ppt)
Found at 6 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 7.6 NG/L (ppt)
Found at 6 providers
Perfluorobutanoicacid (PFBA)
Detected: 4.5 NG/L (ppt)
Found at 4 providers
Perfluoropentanoicacid (PFPEA)
Detected: 8.4 NG/L (ppt)
Found at 7 providers
Combined Radium (-226 & -228)
Detected: 1.07 PCI/L
Found at 5 providers
A naturally occurring radioactive element found in some groundwater.
Aggressive Index
Detected: 12.9 AGGR
Found at 37 providers
Adsorbableorganicfluorine
Detected: 1700 NG/L (ppt)
Found at 3 providers
Radium-226
Detected: 1.03 PCI/L
5/14/2025
Monobromoaceticacid
Detected: 1.2 UG/L (ppb)
8/14/2025
Monochloroaceticacid
Detected: 2.8 UG/L (ppb)
Found at 5 providers
Perfluorononanoicacid (PFNA)
Detected: 2.5 NG/L (ppt)
8/13/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 3.1 NG/L (ppt)
Found at 4 providers
Carbon, Total
Detected: 1.5 MG/L (ppm)
Found at 4 providers
Foamingagents (SURFACTANTS)
Detected: 0.19 MG/L (ppm)
Found at 4 providers
Silica
Detected: 25 MG/L (ppm)
Found at 2 providers
Acetone
Detected: 15 UG/L (ppb)
4/2/2025
Temperature (CENTIGRADE)
Detected: 20.6 C
Found at 2 providers
TotalradiumforntncperΒ§64442(B) (3)
Detected: 0.585 PCI/L
4/7/2025
Trichlorotrifluoroethane
Detected: 63 UG/L (ppb)
3/4/2025
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
1, 2, 3-TrichloropropaneYesYesYes
1, 2-DichloropropaneYesYesYes
TrichlorofluoromethaneYesYesYes
LeadPartialYesPartial
ArsenicPartialYesPartial
Chromium-6 (Hexavalent)PartialYesPartial
CopperPartialYesPartial
Combined UraniumPartialYesPartial
PFOAPartialYes*Partial
PFOSPartialYes*Partial
NitratePartialYesPartial
Combined RadiumPartialYesPartial
Combined UraniumPartialYesPartial
DichloroaceticacidPartialYesPartial
TrichloroaceticacidPartialYesPartial
DibromoaceticacidPartialYesPartial
Vanadium, TotalPartialYesPartial
Chromium, HexPartialYesPartial
Conductivity (at 25Β°C)PartialYesPartial
Nitrate-NitritePartialYesPartial
PerchloratePartialYesPartial
BariumPartialYesPartial
NickelPartialYesPartial
AluminumPartialYesPartial
FluoridePartialYesPartial
SeleniumPartialYesPartial
Copper, FreePartialYesPartial
TDSPartialYesPartial
ChloridePartialYesPartial
SulfatePartialYesPartial
OdorPartialYesPartial
ChromiumPartialYesPartial
ColorPartialYesPartial
1, 2-Dibromo-3-ChloropropanePartialYesPartial
Alkalinity, TotalPartialYesPartial
IronPartialYesPartial
ManganesePartialYesPartial
AtrazinePartialYesPartial
Perfluoroctanoicacid (PFOA)PartialYesPartial
Perfluorobutanesulfonicacid (PFBS)PartialYesPartial
Perfluoroheptanoicacid (PFHPA)PartialYesPartial
Perfluoroctanesulfonicacid (PFOS)PartialYesPartial
Perfluorohexanoicacid (PFHXA)PartialYesPartial
Perfluorobutanoicacid (PFBA)PartialYesPartial
Perfluoropentanoicacid (PFPEA)PartialYesPartial
Combined Radium (-226 & -228)PartialYesPartial
Aggressive IndexPartialYesPartial
AdsorbableorganicfluorinePartialYesPartial
Radium-226PartialYesPartial
PFPEAPartialYes*Partial
PFBSPartialYes*Partial
MonobromoaceticacidPartialYesPartial
MonochloroaceticacidPartialYesPartial
Perfluorononanoicacid (PFNA)PartialYesPartial
Perfluorohexanesulfonicacid (PFHxS)PartialYesPartial
Carbon, TotalPartialYesPartial
LithiumPartialYes*Partial
PFHXSPartialYes*Partial
PFHXAPartialYes*Partial
PFHPAPartialYes*Partial
PFBAPartialYes*Partial
Foamingagents (SURFACTANTS)PartialYesPartial
SilicaPartialYesPartial
StrontiumPartialYesPartial
AcetonePartialYesPartial
ZincPartialYesPartial
Temperature (CENTIGRADE)PartialYesPartial
NitritePartialYesPartial
Boron, TotalPartialYesPartial
Xylene, MetaandparaPartialYesPartial
O-XylenePartialYesPartial
EthylbenzenePartialYesPartial
Xylenes, TotalPartialYesPartial
TotalradiumforntncperΒ§64442(B) (3)PartialYesPartial
TrichlorotrifluoroethanePartialYesPartial
Coliform Bacteria (indicator)NoYesNo
Gross Alpha Particle ActivityNoNoNo
SodiumNoPartialNo
pHNoNoNo
MagnesiumNoPartialNo
CalciumNoPartialNo
Alkalinity, BicarbonateNoNoNo
Hardness, Total (ASCACO3)NoNoNo
Langelier Index (pH(s))NoNoNo
PotassiumNoPartialNo
Alkalinity, CarbonateNoNoNo
pH, FieldNoNoNo
HydroxideascalciumcarbonateNoPartialNo

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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?