Serving roughly 21,437 people in Napa County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for AMERICAN CANYON, CITY OF
1 water provider directly on file, serving roughly 21,437 people in Napa County, California.
Quick answer: AMERICAN CANYON, CITY OF has no violations on file. One reading is worth knowing about: Aggressive Index was measured at 12AGGR, among the highest of the 358 providers on file in this area. It's the most notable figure in this system's record among its 358 local peers.
Lead Summary
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Alkalinity, Total
Alkalinity, Bicarbonate
Carbon, Total
Iron
Aluminum
Color
Aggressive Index
Temperature (CENTIGRADE)
Langelier Index (pH(s))
Langelier Index (Source Temp.)
Magnesium
Potassium
Sodium
Calcium
Orthophosphate
Hardness, Total (ASCACO3)
TDS
Sulfate
Chloride
Nitrate
Turbidity
pH
pH, Field
Odor
Vanadium, Total
Metolachlor
Manganese
Chromium, Hex
Nickel
Chromium
Barium
Arsenic
Copper, Free
Zinc
Conductivity (at 25°C)
Utility AMERICAN CANYON, CITY OFPopulation served 21,437Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2024
Iron
Detected: 300 UG/L (ppb)
10/8/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Aluminum
Detected: 110 UG/L (ppb)
10/8/2025
Vanadium, Total
Detected: 3.3 UG/L (ppb)
10/8/2025
Manganese
Detected: 21 UG/L (ppb)
10/8/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Chromium, Hex
Detected: 0.091 UG/L (ppb)
10/8/2025
Nickel
Detected: 2 UG/L (ppb)
10/8/2025
Chromium
Detected: 0.94 UG/L (ppb)
7/8/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Barium
Detected: 34 UG/L (ppb)
10/8/2025
Arsenic
Detected: 2.7 UG/L (ppb)
10/8/2025
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: 2.8 UG/L (ppb)
10/8/2025
Zinc
Detected: 6.1 UG/L (ppb)
10/8/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 41.8 UG/L (ppb)
7/15/2025
TTHM
Detected: 70.35 UG/L (ppb)
7/15/2025
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: 58.85 UG/L (ppb)
7/15/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 9.66 UG/L (ppb)
7/15/2025
Dibromochloromethane
Detected: 1.84 UG/L (ppb)
7/15/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 9.5 MG/L (ppm)
10/8/2025
Chloride
Detected: 11 MG/L (ppm)
10/8/2025
Nitrate
Detected: 0.14 MG/L (ppm)
1/29/2025
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: 12 MG/L (ppm)
10/8/2025
Potassium
Detected: 1.9 MG/L (ppm)
10/8/2025
Sodium
Detected: 16 MG/L (ppm)
10/8/2025
Calcium
Detected: 16 MG/L (ppm)
10/8/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 0.3 LANG
10/8/2025
Orthophosphate
Detected: 0.14 MG/L (ppm)
10/8/2025
Hardness, Total (ASCACO3)
Detected: 98 MG/L (ppm)
10/8/2025
pH
Detected: 8 PH
10/8/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
pH, Field
Detected: 7.46 PH
10/8/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 96 MG/L (ppm)
10/8/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 20.9 UG/L (ppb)
7/15/2025
Trichloroaceticacid
Detected: 20.9 UG/L (ppb)
7/15/2025
Dibromoaceticacid
Detected: 1.8 UG/L (ppb)
4/29/2025
Alkalinity, Total
Detected: 96 MG/L (ppm)
10/8/2025
Carbon, Total
Detected: 4.4 MG/L (ppm)
10/8/2025
Color
Detected: 70 UNITS
10/8/2025
Aggressive Index
Detected: 12 AGGR
10/8/2025
Temperature (CENTIGRADE)
Detected: 19.1 C
10/8/2025
Langelier Index (Source Temp.)
Detected: -0.26 LANG
10/8/2025
TDS
Detected: 150 MG/L (ppm)
10/8/2025
Turbidity
Detected: 3.36 NTU
10/8/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 3 TON
10/8/2025
Metolachlor
Detected: 0.095 UG/L (ppb)
10/8/2025
Conductivity (at 25°C)
Detected: 236 UMHO/CM
10/8/2025
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.