DINUBA is served by 2 water providers on file with the EPA.
Data current as of July 2026
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Results for DINUBA, CA
2 water providers on file serving this city.
Quick answer: DINUBA'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
Copper, Free
Nitrate
Radium-228
Combined Uranium
Combined Radium (-226 & -228)
1, 2, 3-Trichloropropane
Iron
1, 2-Dibromo-3-Chloropropane
Chromium, Hex
Violations on file
Lead And Copper Rule Revisions
Currently open health violation
Found at 1 of 2 providers
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
Found at 2 providers
Copper, Free
Detected: 86 UG/L (ppb)
8/1/2025
Combined Uranium
Detected: 0.8 PCI/L
5/6/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Iron
Detected: 300 UG/L (ppb)
3/11/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Chromium, Hex
Detected: 2.3 UG/L (ppb)
5/6/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 1.6 UG/L (ppb)
8/6/2025
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: 1.6 UG/L (ppb)
8/6/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 5.3 MG/L (ppm)
9/17/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
1, 2, 3-Trichloropropane
Detected: 0.0029 UG/L (ppb)
5/6/2025
Other
Additional substances tested that don't fit neatly into the categories above
Radium-228
Detected: 0.167 PCI/L
5/15/2025
Combined Radium (-226 & -228)
Detected: 0.522 PCI/L
5/15/2025
A naturally occurring radioactive element found in some groundwater.
1, 2-Dibromo-3-Chloropropane
Detected: 0.05 UG/L (ppb)
9/17/2025
Filtration considerations: General system types, not a specific product recommendation.