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Water Quality Lookup / California / Ventura County / EL RIO
EPA SDWIS · Ventura County, California

Is EL RIO, CA Tap Water Safe?

EL RIO is served by 1 water provider on file with the EPA.

Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for EL RIO, CA

1 water provider on file serving this city.

Quick answer: EL RIO's water has no violations on file and no single reading stands out against its peers (1 other providers in this area). It serves roughly 1,709 people, and the full breakdown below reflects everything EPA and California have on record for it.

Contaminants found

Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Copper, Free
Detected: 123 UG/L (ppb)
7/24/2025
Combined Uranium
Detected: 5.76 PCI/L
7/8/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Selenium
Detected: 7 UG/L (ppb)
5/14/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 2.7 UG/L (ppb)
9/9/2025
TTHM
Detected: 19.5 UG/L (ppb)
9/9/2025
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: 1.2 UG/L (ppb)
9/9/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 9.9 UG/L (ppb)
9/9/2025
Bromodichloromethane
Detected: 2.1 UG/L (ppb)
9/9/2025
Dibromochloromethane
Detected: 6.2 UG/L (ppb)
9/9/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 433.1 MG/L (ppm)
10/7/2025
Chloride
Detected: 52.3 MG/L (ppm)
5/14/2025
Fluoride
Detected: 0.67 MG/L (ppm)
5/14/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 2.7 MG/L (ppm)
10/7/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Nitrate-Nitrite
Detected: 3.9 MG/L (ppm)
5/14/2025
Boron, Total
Detected: 597 UG/L (ppb)
5/14/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Sodium
Detected: 94.7 MG/L (ppm)
5/14/2025
Magnesium
Detected: 47 MG/L (ppm)
7/8/2025
Calcium
Detected: 134 MG/L (ppm)
7/8/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 0.8 LANG
7/8/2025
Hardness, Total (ASCACO3)
Detected: 528 MG/L (ppm)
7/8/2025
Gross Alpha Particle Activity
Detected: 1.51 PCI/L
7/8/2025
pH, Field
Detected: 7.85 PH
7/8/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 260 MG/L (ppm)
7/8/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dibromoaceticacid
Detected: 2.7 UG/L (ppb)
9/9/2025
Aggressive Index
Detected: 12.7 AGGR
7/8/2025
Temperature (CENTIGRADE)
Detected: 18.2 C
7/8/2025
Silica
Detected: 28 MG/L (ppm)
5/14/2025
Alkalinity, Total
Detected: 210 MG/L (ppm)
7/8/2025
TDS
Detected: 930 MG/L (ppm)
10/7/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 2 NG/L (ppt)
10/7/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 2 NG/L (ppt)
10/7/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorobutanoicacid (PFBA)
Detected: 2.7 NG/L (ppt)
3/19/2025
Turbidity
Detected: 0.2 NTU
7/8/2025
A measure of water cloudiness from suspended particles.
Radium-228
Detected: 0.12 PCI/L
7/8/2025
Conductivity (at 25°C)
Detected: 1350 UMHO/CM
7/8/2025
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
LeadPartialYesPartial
ArsenicPartialYesPartial
Chromium-6 (Hexavalent)PartialYesPartial
CopperPartialYesPartial
Combined UraniumPartialYesPartial
PFOAPartialYes*Partial
PFOSPartialYes*Partial
NitratePartialYesPartial
Combined RadiumPartialYesPartial
DibromoaceticacidPartialYesPartial
Copper, FreePartialYesPartial
Aggressive IndexPartialYesPartial
Temperature (CENTIGRADE)PartialYesPartial
SilicaPartialYesPartial
SulfatePartialYesPartial
ChloridePartialYesPartial
Alkalinity, TotalPartialYesPartial
TDSPartialYesPartial
FluoridePartialYesPartial
Nitrate-NitritePartialYesPartial
Perfluorobutanesulfonicacid (PFBS)PartialYesPartial
Perfluoroctanesulfonicacid (PFOS)PartialYesPartial
Perfluorobutanoicacid (PFBA)PartialYesPartial
Combined UraniumPartialYesPartial
Boron, TotalPartialYesPartial
SeleniumPartialYesPartial
Conductivity (at 25°C)PartialYesPartial
Coliform Bacteria (indicator)NoYesNo
Langelier Index (pH(s))NoNoNo
SodiumNoPartialNo
MagnesiumNoPartialNo
CalciumNoPartialNo
Hardness, Total (ASCACO3)NoNoNo
Alkalinity, BicarbonateNoNoNo
Gross Alpha Particle ActivityNoNoNo
pH, FieldNoNoNo

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Learn more
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?
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