SAN JUAN BAUTISTA 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 SAN JUAN BAUTISTA, CA
1 water provider on file serving this city.
Quick answer: SAN JUAN BAUTISTA's water currently has an open health-based violation on file: Lead And Copper Rule Revisions, a compliance issue since 10/17/2024. This is active, not historical — see the violation detail below for what EPA's enforcement record shows.
Lead Summary
TTHM
Bromoform
Bromodichloromethane
Dibromochloromethane
Dibromoaceticacid
Copper, Free
Iron
Nitrate
Combined Uranium
Gross Alpha Particle Activity
Chromium, Hex
Manganese
Violations on file
Lead And Copper Rule Revisions
Currently open health violation
Found at 1 of 1 provider
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: 112 UG/L (ppb)
8/10/2025
Iron
Detected: 30 UG/L (ppb)
8/18/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Combined Uranium
Detected: 4.9 PCI/L
8/19/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Chromium, Hex
Detected: 0.16 UG/L (ppb)
3/21/2025
Manganese
Detected: 258 UG/L (ppb)
7/28/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 8 UG/L (ppb)
8/19/2025
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.
Bromoform
Detected: 4 UG/L (ppb)
8/19/2025
Bromodichloromethane
Detected: 1 UG/L (ppb)
8/19/2025
Dibromochloromethane
Detected: 3 UG/L (ppb)
8/19/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 1.02 MG/L (ppm)
3/28/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Gross Alpha Particle Activity
Detected: 4.83 PCI/L
8/19/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dibromoaceticacid
Detected: 3 UG/L (ppb)
8/19/2025
Filtration considerations: General system types, not a specific product recommendation.
Contaminant
Whole-House Carbon
Under-Sink RO
Under-Sink Carbon
Total Trihalomethanes (TTHM)
Yes
Yes
Yes
Haloacetic Acids (HAA5)
Yes
Yes
Yes
Chloroform
Yes
Yes
Yes
Chlorine / Taste
Yes
Yes
Yes
Sediment / Turbidity
Yes
Yes
Yes
Trichloroethylene
Yes
Yes
Yes
Tetrachloroethylene
Yes
Yes
Yes
cis-1,2-Dichloroethylene
Yes
Yes
Yes
1,1-Dichloroethylene
Yes
Yes
Yes
Bromoform
Yes
Yes
Yes
Bromodichloromethane
Yes
Yes
Yes
Dibromochloromethane
Yes
Yes
Yes
1,1,2-Trichloroethane
Yes
Yes
Yes
Vinyl Chloride
Yes
Yes
Yes
Carbon Tetrachloride
Yes
Yes
Yes
Benzene
Yes
Yes
Yes
Toluene
Yes
Yes
Yes
Xylene
Yes
Yes
Yes
Lead
Partial
Yes
Partial
Arsenic
Partial
Yes
Partial
Chromium-6 (Hexavalent)
Partial
Yes
Partial
Copper
Partial
Yes
Partial
Combined Uranium
Partial
Yes
Partial
PFOA
Partial
Yes*
Partial
PFOS
Partial
Yes*
Partial
Nitrate
Partial
Yes
Partial
Combined Radium
Partial
Yes
Partial
Dibromoaceticacid
Partial
Yes
Partial
Copper, Free
Partial
Yes
Partial
Iron
Partial
Yes
Partial
Combined Uranium
Partial
Yes
Partial
Chromium, Hex
Partial
Yes
Partial
Manganese
Partial
Yes
Partial
Coliform Bacteria (indicator)
No
Yes
No
Gross Alpha Particle Activity
No
No
No
Individual water providers
SAN JUAN BAUTISTA, CITY OFOpen violation — pop. 2,335