SONORA is served by 3 water providers on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for SONORA, CA
3 water providers on file serving this city.
Quick answer: SONORA's water has no violations on file and no single reading stands out against its peers (3 other providers in this area). It serves roughly 1,761 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dichloroaceticacid
Trichloroaceticacid
Monochloroaceticacid
Aggressive Index
Langelier Index (pH(s))
Magnesium
Calcium
Sodium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
Carbon, Total
TDS
Turbidity
pH
Iron
Manganese
Copper, Free
Conductivity (at 25°C)
Color
Foamingagents (SURFACTANTS)
Chloride
Potassium
Sulfate
Fluoride
Nitrite
Nitrate
Radium-228
Combined Uranium
Combined Radium (-226 & -228)
Gross Alpha Particle Activity
pH, Field
Odor
Atrazine
Barium
Vanadium, Total
Chromium
Zinc
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
Iron
Detected: 5430 UG/L (ppb)
Found at 2 providers
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 500 UG/L (ppb)
Found at 2 providers
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Copper, Free
Detected: 15 UG/L (ppb)
8/5/2025
Combined Uranium
Detected: 9.98 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.
Barium
Detected: 380 UG/L (ppb)
6/9/2025
Vanadium, Total
Detected: 3 UG/L (ppb)
8/6/2025
Chromium
Detected: 10 UG/L (ppb)
8/6/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Zinc
Detected: 60 UG/L (ppb)
8/6/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 51 UG/L (ppb)
10/6/2025
TTHM
Detected: 68 UG/L (ppb)
10/6/2025
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.
Chloroform
Detected: 66 UG/L (ppb)
10/6/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 1.8 UG/L (ppb)
10/6/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 170 MG/L (ppm)
Found at 3 providers
Sulfate
Detected: 34 MG/L (ppm)
Found at 2 providers
Fluoride
Detected: 0.18 MG/L (ppm)
Found at 2 providers
Often added deliberately for dental health; can also occur naturally.
Nitrite
Detected: 0.61 MG/L (ppm)
6/9/2025
Nitrate
Detected: 6.6 MG/L (ppm)
9/23/2025
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: 74 MG/L (ppm)
Found at 3 providers
Calcium
Detected: 180 MG/L (ppm)
Found at 3 providers
Sodium
Detected: 37 MG/L (ppm)
Found at 3 providers
Potassium
Detected: 3.1 MG/L (ppm)
Found at 2 providers
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: -0.2 LANG
Found at 2 providers
Hardness, Total (ASCACO3)
Detected: 760 MG/L (ppm)
Found at 3 providers
pH
Detected: 6.5 PH
8/5/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Gross Alpha Particle Activity
Detected: 9.06 PCI/L
9/23/2025
pH, Field
Detected: 7.216 PH
Found at 2 providers
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 1049 MG/L (ppm)
Found at 3 providers
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 27 UG/L (ppb)
10/6/2025
Trichloroaceticacid
Detected: 19 UG/L (ppb)
10/6/2025
Monochloroaceticacid
Detected: 5.9 UG/L (ppb)
10/6/2025
Aggressive Index
Detected: 11.7 AGGR
Found at 2 providers
Alkalinity, Total
Detected: 860 MG/L (ppm)
Found at 3 providers
Carbon, Total
Detected: 2.8 MG/L (ppm)
10/6/2025
TDS
Detected: 1000 MG/L (ppm)
Found at 3 providers
Turbidity
Detected: 2.3 NTU
Found at 2 providers
A measure of water cloudiness from suspended particles.
Conductivity (at 25°C)
Detected: 1400 UMHO/CM
Found at 3 providers
Color
Detected: 15 UNITS
Found at 2 providers
Foamingagents (SURFACTANTS)
Detected: 0.16 MG/L (ppm)
1/27/2025
Radium-228
Detected: 0.833 PCI/L
9/23/2025
Combined Radium (-226 & -228)
Detected: 1.08 PCI/L
9/23/2025
A naturally occurring radioactive element found in some groundwater.
Odor
Detected: 4 TON
6/9/2025
Atrazine
Detected: 0.1 UG/L (ppb)
6/9/2025
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
Totalhaloaceticacids (HAA5)
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
Dichloroaceticacid
Partial
Yes
Partial
Trichloroaceticacid
Partial
Yes
Partial
Monochloroaceticacid
Partial
Yes
Partial
Aggressive Index
Partial
Yes
Partial
Alkalinity, Total
Partial
Yes
Partial
Carbon, Total
Partial
Yes
Partial
TDS
Partial
Yes
Partial
Iron
Partial
Yes
Partial
Manganese
Partial
Yes
Partial
Copper, Free
Partial
Yes
Partial
Conductivity (at 25°C)
Partial
Yes
Partial
Color
Partial
Yes
Partial
Foamingagents (SURFACTANTS)
Partial
Yes
Partial
Chloride
Partial
Yes
Partial
Sulfate
Partial
Yes
Partial
Fluoride
Partial
Yes
Partial
Nitrite
Partial
Yes
Partial
Combined Uranium
Partial
Yes
Partial
Combined Radium (-226 & -228)
Partial
Yes
Partial
Odor
Partial
Yes
Partial
Atrazine
Partial
Yes
Partial
Barium
Partial
Yes
Partial
Vanadium, Total
Partial
Yes
Partial
Chromium
Partial
Yes
Partial
Zinc
Partial
Yes
Partial
Coliform Bacteria (indicator)
No
Yes
No
Langelier Index (pH(s))
No
No
No
Magnesium
No
Partial
No
Calcium
No
Partial
No
Sodium
No
Partial
No
Alkalinity, Bicarbonate
No
No
No
Hardness, Total (ASCACO3)
No
No
No
pH
No
No
No
Potassium
No
Partial
No
Gross Alpha Particle Activity
No
No
No
pH, Field
No
No
No
Individual water providers
TUD - TUOLUMNE WATER SYSTEMNo violations on file — pop. 1,761
APPLE VALLEY FARMSNo violations on file — pop. 40
NATURE WHOLE FOOD DEPOTNo violations on file — pop. 26