Serving roughly 7,481 people in Stanislaus County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for HUGHSON, CITY OF
1 water provider directly on file, serving roughly 7,481 people in Stanislaus County, California.
Quick answer: HUGHSON, CITY OF has no violation currently counted toward its compliance status. EPA's record shows a Arsenic violation dating to 04/01/2011 (15 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
Lead
Bromoform
Dibromochloromethane
Dibromoaceticacid
Copper, Free
Iron, Dissolved
Iron
Manganese
Perchlorate
Arsenic
Aggressive Index
Langelier Index (pH(s))
Magnesium
Potassium
Sodium
Hardness, Total (ASCACO3)
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Sulfate
Chloride
Fluoride
Nitrate
Nitrate-Nitrite
Turbidity
Gross Alpha Particle Activity
pH, Field
Boron, Total
1, 2, 3-Trichloropropane
Chromium, Hex
Chromium
Barium
Conductivity (at 25°C)
Utility HUGHSON, CITY OFPopulation served 7,481Owner Local government
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Lead
Detected: 5 UG/L (ppb)
7/1/2025
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: 65 UG/L (ppb)
7/1/2025
Iron, Dissolved
Detected: 40 UG/L (ppb)
2/25/2025
Iron
Detected: 170 UG/L (ppb)
10/21/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 2.1 UG/L (ppb)
10/21/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Arsenic
Detected: 9 UG/L (ppb)
10/21/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Chromium, Hex
Detected: 1.8 UG/L (ppb)
4/1/2025
Chromium
Detected: 13 UG/L (ppb)
7/1/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Barium
Detected: 185 UG/L (ppb)
7/1/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Bromoform
Detected: 1 UG/L (ppb)
7/1/2025
Dibromochloromethane
Detected: 1 UG/L (ppb)
7/1/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 32.9 MG/L (ppm)
7/1/2025
Chloride
Detected: 80 MG/L (ppm)
7/1/2025
Fluoride
Detected: 0.1 MG/L (ppm)
7/1/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 8.1 MG/L (ppm)
7/1/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Nitrate-Nitrite
Detected: 8.4 MG/L (ppm)
7/1/2025
Boron, Total
Detected: 100 UG/L (ppb)
7/1/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 13 MG/L (ppm)
7/1/2025
Potassium
Detected: 4 MG/L (ppm)
7/1/2025
Sodium
Detected: 78 MG/L (ppm)
7/1/2025
Calcium
Detected: 33 MG/L (ppm)
7/1/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 1 LANG
7/1/2025
Hardness, Total (ASCACO3)
Detected: 136 MG/L (ppm)
7/1/2025
Gross Alpha Particle Activity
Detected: 2.37 PCI/L
10/7/2025
pH, Field
Detected: 6.67 PH
7/1/2025
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
1, 2, 3-Trichloropropane
Detected: 0.006 UG/L (ppb)
10/7/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 220 MG/L (ppm)
7/1/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dibromoaceticacid
Detected: 2 UG/L (ppb)
7/1/2025
Perchlorate
Detected: 1.7 UG/L (ppb)
10/7/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Aggressive Index
Detected: 10.9 AGGR
7/1/2025
Alkalinity, Total
Detected: 180 MG/L (ppm)
7/1/2025
TDS
Detected: 480 MG/L (ppm)
7/1/2025
Turbidity
Detected: 0.1 NTU
7/1/2025
A measure of water cloudiness from suspended particles.
Conductivity (at 25°C)
Detected: 711 UMHO/CM
7/1/2025
Filtration considerations: See the table below for how whole-house carbon, under-sink reverse osmosis, and under-sink carbon systems compare against what's actually on file here. These are general system types, not a specific product recommendation.