Serving roughly 7,452 people in Merced County, California.
Data current as of July 2026
🔍Straight from EPA
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Results for CITY OF DOS PALOS
1 water provider directly on file, serving roughly 7,452 people in Merced County, California.
Quick answer: CITY OF DOS PALOS has no violation currently counted toward its compliance status. EPA's record shows a TTHM violation dating to 04/01/2014 (12 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
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Monobromoaceticacid
Alkalinity, Total
Alkalinity, Bicarbonate
Carbon, Total
Magnesium
Potassium
Sodium
Calcium
TDS
Sulfate
Chloride
Nitrate
pH
Iron
Manganese
Aluminum
Zinc
Conductivity (at 25°C)
Color
Utility CITY OF DOS PALOSPopulation served 7,452Owner Local government
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.
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2023
Iron
Detected: 291 UG/L (ppb)
8/6/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 24.8 UG/L (ppb)
8/6/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Aluminum
Detected: 127 UG/L (ppb)
8/6/2025
Zinc
Detected: 67.9 UG/L (ppb)
8/6/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 37.8 UG/L (ppb)
2/26/2025
TTHM
Detected: 90.3 UG/L (ppb)
10/1/2025
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: 6.31 UG/L (ppb)
10/1/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 27.5 UG/L (ppb)
10/1/2025
Bromodichloromethane
Detected: 19.5 UG/L (ppb)
10/1/2025
Dibromochloromethane
Detected: 36.9 UG/L (ppb)
10/1/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 11 MG/L (ppm)
8/6/2025
Chloride
Detected: 26.7 MG/L (ppm)
8/6/2025
Nitrate
Detected: 0.6 MG/L (ppm)
8/6/2025
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
Magnesium
Detected: 8.2 MG/L (ppm)
8/6/2025
Potassium
Detected: 2.8 MG/L (ppm)
8/6/2025
Sodium
Detected: 23.2 MG/L (ppm)
8/6/2025
Calcium
Detected: 13.6 MG/L (ppm)
8/6/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
pH
Detected: 7.6 PH
8/6/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 53.9 MG/L (ppm)
10/1/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 16.7 UG/L (ppb)
2/26/2025
Trichloroaceticacid
Detected: 16 UG/L (ppb)
2/26/2025
Dibromoaceticacid
Detected: 5.1 UG/L (ppb)
2/26/2025
Monobromoaceticacid
Detected: 3 UG/L (ppb)
2/5/2025
Alkalinity, Total
Detected: 53.9 MG/L (ppm)
10/1/2025
Carbon, Total
Detected: 2.4 MG/L (ppm)
10/1/2025
TDS
Detected: 120 MG/L (ppm)
8/6/2025
Conductivity (at 25°C)
Detected: 285 UMHO/CM
8/6/2025
Color
Detected: 15 UNITS
8/6/2025
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.