GONZALES is served by 2 water providers on file with the EPA.
Data current as of July 2026
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Results for GONZALES, CA
2 water providers on file serving this city.
Quick answer: GONZALES's water has no violation currently counted toward its compliance status. EPA's record shows a Nitrate violation dating to 10/01/1985 (41 years ago) — because it's more than five years past its deadline, EPA's policy no longer treats it as part of this system's current standing, though it remains on the public record.
Lead Summary
Copper Summary
Lithium
TTHM
Bromoform
Langelier Index (pH(s))
Potassium
Magnesium
Sodium
Calcium
Alkalinity, Bicarbonate
Alkalinity, Total
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
Fluoride
Nitrate
Turbidity
pH
Odor
Manganese
Chromium
Barium
Arsenic
Copper, Free
Zinc
Conductivity (at 25°C)
Violations on file
Nitrate
Older/archived health-based violation
Found at 1 of 2 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
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 Summary
Detected: 88.4 mg/L (ppm)
12/31/2013
Manganese
Detected: 1 UG/L (ppb)
1/7/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Chromium
Detected: 3 UG/L (ppb)
1/7/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Barium
Detected: 81 UG/L (ppb)
1/7/2025
Arsenic
Detected: 2 UG/L (ppb)
1/7/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Copper, Free
Detected: 10 UG/L (ppb)
1/7/2025
Zinc
Detected: 19 UG/L (ppb)
1/7/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 0.55 UG/L (ppb)
8/5/2025
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: 0.55 UG/L (ppb)
8/5/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 46 MG/L (ppm)
1/7/2025
Sulfate
Detected: 140 MG/L (ppm)
1/7/2025
Fluoride
Detected: 0.08 MG/L (ppm)
1/7/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 0.8 MG/L (ppm)
Found at 2 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Minerals
Everyday minerals that mainly affect taste and water hardness
Potassium
Detected: 3.3 MG/L (ppm)
1/7/2025
Magnesium
Detected: 24 MG/L (ppm)
1/7/2025
Sodium
Detected: 32 MG/L (ppm)
1/7/2025
Calcium
Detected: 89 MG/L (ppm)
1/7/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: -0.21 LANG
1/7/2025
Hardness, Total (ASCACO3)
Detected: 321 MG/L (ppm)
1/7/2025
pH
Detected: 6.6 PH
1/7/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 15.8 µg/L (ppb)
9/12/2023
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 187.9 MG/L (ppm)
1/7/2025
Other
Additional substances tested that don't fit neatly into the categories above
Alkalinity, Total
Detected: 154 MG/L (ppm)
1/7/2025
TDS
Detected: 530 MG/L (ppm)
1/7/2025
Turbidity
Detected: 0.3 NTU
1/7/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 1 TON
1/7/2025
Conductivity (at 25°C)
Detected: 763 UMHO/CM
1/7/2025
Filtration considerations: General system types, not a specific product recommendation.