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Water Quality Lookup / California / San Bernardino County
EPA SDWIS Β· San Bernardino County, California Β· 669 providers profiled

San Bernardino County, CA Water Quality Report

San Bernardino County is served by 669 major public water systems on file with the EPA.

Data current as of July 2026
πŸ”Straight from EPA
πŸ§ͺReal Lab Results
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Results for San Bernardino County, CA

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

Quick answer: San Bernardino County has 669 water providers profiled, sorted by population served.

Violations on file

Nitrate
Older/archived health-based violation
Found at 19 of 669 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 669 providers
Fluoride
Older/archived health-based violation
Found at 13 of 669 providers
Often added deliberately for dental health; can also occur naturally.
Coliform (TCR)
Older/archived health-based violation
Found at 11 of 669 providers
Combined Uranium
Older/archived health-based violation
Found at 6 of 669 providers
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Lead And Copper Rule Revisions
Currently open health violation
Found at 23 of 669 providers
Revised Total Coliform Rule
Older/archived health-based violation
Found at 2 of 669 providers
Arsenic
Older/archived health-based violation
Found at 4 of 669 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.
Groundwater Rule
Currently open health violation
Found at 1 of 669 providers
Surface Water Treatment Rule
Older/archived health-based violation
Found at 1 of 669 providers
Interim Enhanced Surface Water Treatment Rule
Older/archived health-based violation
Found at 1 of 669 providers
TTHM
Older/archived health-based violation
Found at 1 of 669 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.

Contaminants found

Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.145 mg/L (ppm)
Found at 206 providers
Copper Summary
Detected: 30 mg/L (ppm)
Found at 23 providers
Lead
Detected: 65 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.
Copper, Free
Detected: 860 UG/L (ppb)
Found at 69 providers
Vanadium, Total
Detected: 130 UG/L (ppb)
Found at 38 providers
Chromium, Hex
Detected: 21 UG/L (ppb)
Found at 83 providers
Combined Uranium
Detected: 100 PCI/L
Found at 56 providers
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Arsenic
Detected: 190 UG/L (ppb)
Found at 50 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.
Iron
Detected: 1400 UG/L (ppb)
Found at 28 providers
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 2900 UG/L (ppb)
Found at 18 providers
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Aluminum
Detected: 400 UG/L (ppb)
Found at 7 providers
Barium
Detected: 150 UG/L (ppb)
Found at 19 providers
Chromium
Detected: 23 UG/L (ppb)
Found at 19 providers
Occurs in two forms β€” trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Nickel
Detected: 16 UG/L (ppb)
Found at 4 providers
Zinc
Detected: 130 UG/L (ppb)
Found at 5 providers
Selenium
Detected: 7.7 UG/L (ppb)
Found at 6 providers
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 34.3 UG/L (ppb)
Found at 49 providers
TTHM
Detected: 111.1 UG/L (ppb)
Found at 81 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: 28 UG/L (ppb)
Found at 59 providers
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 28.4 UG/L (ppb)
Found at 61 providers
Dibromochloromethane
Detected: 36.1 UG/L (ppb)
Found at 67 providers
Bromoform
Detected: 38.4 UG/L (ppb)
Found at 69 providers
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 46 MG/L (ppm)
Found at 187 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Fluoride
Detected: 4.5 MG/L (ppm)
Found at 73 providers
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 11 MG/L (ppm)
Found at 43 providers
Sulfate
Detected: 380 MG/L (ppm)
Found at 61 providers
Chloride
Detected: 260 MG/L (ppm)
Found at 61 providers
Boron, Total
Detected: 1800 UG/L (ppb)
Found at 17 providers
Nitrite
Detected: 0.152 MG/L (ppm)
8/6/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 110 MG/L (ppm)
Found at 62 providers
Potassium
Detected: 8.3 MG/L (ppm)
Found at 50 providers
Sodium
Detected: 400 MG/L (ppm)
Found at 59 providers
Calcium
Detected: 320 MG/L (ppm)
Found at 65 providers
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Gross Alpha Particle Activity
Detected: 39 PCI/L
Found at 56 providers
Hardness, Total (ASCACO3)
Detected: 1200 MG/L (ppm)
Found at 63 providers
pH
Detected: 9.4 PH
Found at 58 providers
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Di(2-Ethylhexyl)Phthalate
Detected: 6.8 UG/L (ppb)
5/16/2025
Langelier Index (pH(s))
Detected: 1.4 LANG
Found at 14 providers
pH, Field
Detected: 8.64 PH
8/4/2025
Orthophosphate
Detected: 0.58 MG/L (ppm)
Found at 2 providers
Phosphate, Total
Detected: 1800 UG/L (ppb)
6/2/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFOS
Detected: 0.2365 Β΅g/L (ppb)
Found at 15 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXS
Detected: 0.019 Β΅g/L (ppb)
Found at 20 providers
Lithium
Detected: 80.8 Β΅g/L (ppb)
Found at 24 providers
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFPEA
Detected: 0.018 Β΅g/L (ppb)
Found at 19 providers
PFOA
Detected: 0.03 Β΅g/L (ppb)
Found at 15 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXA
Detected: 0.017 Β΅g/L (ppb)
Found at 19 providers
PFHPA
Detected: 0.0128 Β΅g/L (ppb)
Found at 7 providers
Pfda
Detected: 0.0034 Β΅g/L (ppb)
1/31/2024
PFNA
Detected: 0.0071 Β΅g/L (ppb)
Found at 2 providers
PFBS
Detected: 0.0117 Β΅g/L (ppb)
Found at 15 providers
Pfpes
Detected: 0.0108 Β΅g/L (ppb)
Found at 3 providers
6:2 Fts
Detected: 0.0503 Β΅g/L (ppb)
7/19/2023
PFBA
Detected: 0.01 Β΅g/L (ppb)
Found at 6 providers
Pfhps
Detected: 0.0055 Β΅g/L (ppb)
7/29/2025
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Carbontetrachloride
Detected: 0.6 UG/L (ppb)
8/12/2025
Trichloroethylene
Detected: 9.4 UG/L (ppb)
Found at 4 providers
1, 1-Dichloroethylene
Detected: 0.55 UG/L (ppb)
Found at 2 providers
Cis-1, 2-Dichloroethylene
Detected: 1.3 UG/L (ppb)
Found at 2 providers
1, 2, 3-Trichloropropane
Detected: 0.086 UG/L (ppb)
Found at 3 providers
1, 1-Dichloroethane
Detected: 0.5 UG/L (ppb)
10/8/2025
1, 2-Dichloropropane
Detected: 3.4 UG/L (ppb)
10/8/2025
Tetrachloroethylene
Detected: 3.7 UG/L (ppb)
Found at 2 providers
Dichlorodifluoromethane
Detected: 0.57 UG/L (ppb)
9/29/2025
Bromide
Detected: 0.061 MG/L (ppm)
Found at 3 providers
Petroleum Compounds
Substances associated with fuel or petroleum contamination
Xylenes, Total
Detected: 0.64 UG/L (ppb)
1/30/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 900 MG/L (ppm)
Found at 59 providers
Alkalinity, Carbonate
Detected: 46 MG/L (ppm)
Found at 8 providers
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 14.9 UG/L (ppb)
Found at 41 providers
Trichloroaceticacid
Detected: 19.4 UG/L (ppb)
Found at 35 providers
Dibromoaceticacid
Detected: 12 UG/L (ppb)
Found at 42 providers
Perchlorate
Detected: 19 UG/L (ppb)
Found at 23 providers
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Radium-228
Detected: 1.85 PCI/L
Found at 19 providers
Combined Radium (-226 & -228)
Detected: 3.48 PCI/L
Found at 6 providers
A naturally occurring radioactive element found in some groundwater.
Perfluorobutanesulfonicacid (PFBS)
Detected: 8.2 NG/L (ppt)
Found at 26 providers
Perfluorohexanesulfonicacid (PFHxS)
Detected: 18 NG/L (ppt)
Found at 22 providers
Perfluoroctanoicacid (PFOA)
Detected: 12 NG/L (ppt)
Found at 24 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 13 NG/L (ppt)
Found at 23 providers
Perfluoropentanoicacid (PFPEA)
Detected: 11 NG/L (ppt)
Found at 23 providers
TDS
Detected: 2000 MG/L (ppm)
Found at 76 providers
Alkalinity, Total
Detected: 740 MG/L (ppm)
Found at 62 providers
Turbidity
Detected: 12 NTU
Found at 53 providers
A measure of water cloudiness from suspended particles.
Odor
Detected: 2 TON
Found at 47 providers
Conductivity (at 25Β°C)
Detected: 2400 UMHO/CM
Found at 57 providers
Foamingagents (SURFACTANTS)
Detected: 0.39 MG/L (ppm)
Found at 11 providers
Perfluoroctanesulfonicacid (PFOS)
Detected: 21 NG/L (ppt)
Found at 18 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorobutanoicacid (PFBA)
Detected: 10 NG/L (ppt)
Found at 18 providers
Perfluoroheptanoicacid (PFHPA)
Detected: 4.8 NG/L (ppt)
Found at 13 providers
Adsorbableorganicfluorine
Detected: 4300 NG/L (ppt)
Found at 11 providers
Perfluoropentanesulfonicacid (PFPES)
Detected: 4.6 NG/L (ppt)
Found at 6 providers
Color
Detected: 20 UNITS
Found at 14 providers
Aggressive Index
Detected: 13 AGGR
Found at 16 providers
Langelier Index (Source Temp.)
Detected: 0.8 LANG
Found at 13 providers
Methyltert-Butylether
Detected: 6.3 UG/L (ppb)
Found at 2 providers
Carbon, Total
Detected: 3.3 MG/L (ppm)
Found at 6 providers
Radium-226
Detected: 2.74 PCI/L
Found at 3 providers
1, 2-Dibromo-3-Chloropropane
Detected: 0.12 UG/L (ppb)
Found at 4 providers
Temperature (CENTIGRADE)
Detected: 25 C
Found at 5 providers
Gross Beta Particle Activity
Detected: 3.26 PCI/L
Found at 2 providers
Radon
Detected: 646 PCI/L
8/13/2025
Chlorate
Detected: 250 UG/L (ppb)
Found at 2 providers
Bromacil
Detected: 0.13 UG/L (ppb)
3/11/2025
Perfluorodecanoicacid (PFDA)
Detected: 2.4 NG/L (ppt)
1/22/2025
TotalradiumforntncperΒ§64442(B) (3)
Detected: 0.91 PCI/L
Found at 2 providers
Silica
Detected: 21 MG/L (ppm)
9/9/2025
Perfluorononanoicacid (PFNA)
Detected: 2.3 NG/L (ppt)
7/23/2025
Monochloroaceticacid
Detected: 2.8 UG/L (ppb)
9/24/2025
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
CarbontetrachlorideYesYesYes
1, 2, 3-TrichloropropaneYesYesYes
1, 1-DichloroethaneYesYesYes
1, 2-DichloropropaneYesYesYes
DichlorodifluoromethaneYesYesYes
BromideYesYesYes
LeadPartialYesPartial
ArsenicPartialYesPartial
Chromium-6 (Hexavalent)PartialYesPartial
CopperPartialYesPartial
Combined UraniumPartialYesPartial
PFOAPartialYes*Partial
PFOSPartialYes*Partial
NitratePartialYesPartial
Combined RadiumPartialYesPartial
DichloroaceticacidPartialYesPartial
TrichloroaceticacidPartialYesPartial
DibromoaceticacidPartialYesPartial
Copper, FreePartialYesPartial
FluoridePartialYesPartial
Nitrate-NitritePartialYesPartial
Vanadium, TotalPartialYesPartial
Chromium, HexPartialYesPartial
PerchloratePartialYesPartial
Combined UraniumPartialYesPartial
Combined Radium (-226 & -228)PartialYesPartial
Perfluorobutanesulfonicacid (PFBS)PartialYesPartial
Perfluorohexanesulfonicacid (PFHxS)PartialYesPartial
Perfluoroctanoicacid (PFOA)PartialYesPartial
Perfluorohexanoicacid (PFHXA)PartialYesPartial
Perfluoropentanoicacid (PFPEA)PartialYesPartial
IronPartialYesPartial
ManganesePartialYesPartial
TDSPartialYesPartial
Alkalinity, TotalPartialYesPartial
SulfatePartialYesPartial
OdorPartialYesPartial
Conductivity (at 25Β°C)PartialYesPartial
Foamingagents (SURFACTANTS)PartialYesPartial
ChloridePartialYesPartial
Boron, TotalPartialYesPartial
AluminumPartialYesPartial
Perfluoroctanesulfonicacid (PFOS)PartialYesPartial
Perfluorobutanoicacid (PFBA)PartialYesPartial
Perfluoroheptanoicacid (PFHPA)PartialYesPartial
AdsorbableorganicfluorinePartialYesPartial
PFHXSPartialYes*Partial
LithiumPartialYes*Partial
Perfluoropentanesulfonicacid (PFPES)PartialYesPartial
BariumPartialYesPartial
ColorPartialYesPartial
ChromiumPartialYesPartial
NickelPartialYesPartial
Aggressive IndexPartialYesPartial
Langelier Index (Source Temp.)PartialYesPartial
Methyltert-ButyletherPartialYesPartial
PFPEAPartialYes*Partial
PFHXAPartialYes*Partial
PFHPAPartialYes*Partial
PfdaPartialYes*Partial
PFNAPartialYes*Partial
Carbon, TotalPartialYesPartial
Radium-226PartialYesPartial
PFBSPartialYes*Partial
PfpesPartialYes*Partial
1, 2-Dibromo-3-ChloropropanePartialYesPartial
Temperature (CENTIGRADE)PartialYesPartial
6:2 FtsPartialYes*Partial
PFBAPartialYes*Partial
ZincPartialYesPartial
Gross Beta Particle ActivityPartialYesPartial
RadonPartialYesPartial
ChloratePartialYesPartial
BromacilPartialYesPartial
Perfluorodecanoicacid (PFDA)PartialYesPartial
TotalradiumforntncperΒ§64442(B) (3)PartialYesPartial
SeleniumPartialYesPartial
PfhpsPartialYes*Partial
SilicaPartialYesPartial
Perfluorononanoicacid (PFNA)PartialYesPartial
NitritePartialYesPartial
Xylenes, TotalPartialYesPartial
MonochloroaceticacidPartialYesPartial
Coliform Bacteria (indicator)NoYesNo
Gross Alpha Particle ActivityNoNoNo
MagnesiumNoPartialNo
PotassiumNoPartialNo
SodiumNoPartialNo
Hardness, Total (ASCACO3)NoNoNo
CalciumNoPartialNo
Alkalinity, BicarbonateNoNoNo
pHNoNoNo
Di(2-Ethylhexyl)PhthalateNoNoNo
Alkalinity, CarbonateNoNoNo
Langelier Index (pH(s))NoNoNo
pH, FieldNoNoNo
OrthophosphateNoNoNo
Phosphate, TotalNoNoNo

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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?