Serving roughly 46,525 people in San Bernardino County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for COLTON, CITY OF
1 water provider directly on file, serving roughly 46,525 people in San Bernardino County, California.
Quick answer: COLTON, CITY OF has no violations on file. One reading is worth knowing about: Perfluoroheptanoicacid (PFHPA) was measured at 4.8NG/L, among the highest of the 669 providers on file in this area. It's the most notable figure in this system's record among its 669 local peers.
Lead Summary
PFOA
PFOS
PFHXS
PFBS
PFHXA
PFPEA
Lead
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dibromochloromethane
Bromoform
Dichloroaceticacid
Copper, Free
Perchlorate
Magnesium
Potassium
Sodium
Calcium
Hardness, Total (ASCACO3)
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Sulfate
Chloride
Fluoride
Nitrate
Nitrate-Nitrite
Perfluorobutanesulfonicacid (PFBS)
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
Perfluoroheptanoicacid (PFHPA)
Turbidity
Combined Uranium
Radium-226
Radium-228
Gross Alpha Particle Activity
pH
Odor
Boron, Total
Vanadium, Total
Iron
Manganese
Chromium, Hex
Cis-1, 2-Dichloroethylene
Arsenic
Conductivity (at 25°C)
Utility COLTON, CITY OFPopulation served 46,525Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Lead
Detected: 15 UG/L (ppb)
7/30/2025
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: 54 UG/L (ppb)
7/31/2025
Combined Uranium
Detected: 5 PCI/L
7/16/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Vanadium, Total
Detected: 17 UG/L (ppb)
9/19/2025
Iron
Detected: 150 UG/L (ppb)
9/19/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 23 UG/L (ppb)
1/28/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Chromium, Hex
Detected: 5.6 UG/L (ppb)
9/19/2025
Arsenic
Detected: 2.3 UG/L (ppb)
9/19/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 1.2 UG/L (ppb)
7/16/2025
TTHM
Detected: 26 UG/L (ppb)
9/19/2025
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: 19 UG/L (ppb)
9/19/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 3.2 UG/L (ppb)
9/19/2025
Dibromochloromethane
Detected: 1.8 UG/L (ppb)
9/19/2025
Bromoform
Detected: 1.6 UG/L (ppb)
9/19/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 67 MG/L (ppm)
9/19/2025
Chloride
Detected: 90 MG/L (ppm)
9/19/2025
Fluoride
Detected: 1.2 MG/L (ppm)
9/19/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 5.4 MG/L (ppm)
9/19/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Nitrate-Nitrite
Detected: 5.4 MG/L (ppm)
9/19/2025
Boron, Total
Detected: 370 UG/L (ppb)
9/19/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 13 MG/L (ppm)
9/19/2025
Potassium
Detected: 3 MG/L (ppm)
9/19/2025
Sodium
Detected: 130 MG/L (ppm)
9/19/2025
Calcium
Detected: 41 MG/L (ppm)
9/19/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 160 MG/L (ppm)
9/19/2025
Gross Alpha Particle Activity
Detected: 3.6 PCI/L
4/15/2025
pH
Detected: 8 PH
9/19/2025
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
PFOA
Detected: 0.0059 µg/L (ppb)
8/30/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFOS
Detected: 0.013 µg/L (ppb)
1/29/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXS
Detected: 0.0051 µg/L (ppb)
1/29/2024
PFBS
Detected: 0.0053 µg/L (ppb)
8/30/2023
PFHXA
Detected: 0.0035 µg/L (ppb)
1/23/2024
PFPEA
Detected: 0.0043 µg/L (ppb)
1/23/2024
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Cis-1, 2-Dichloroethylene
Detected: 0.55 UG/L (ppb)
3/19/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 290 MG/L (ppm)
9/19/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 1.2 UG/L (ppb)
7/16/2025
Perchlorate
Detected: 17 UG/L (ppb)
10/22/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Alkalinity, Total
Detected: 240 MG/L (ppm)
9/19/2025
TDS
Detected: 510 MG/L (ppm)
9/19/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 3.4 NG/L (ppt)
10/1/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 4.9 NG/L (ppt)
10/1/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 17 NG/L (ppt)
10/1/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 4.1 NG/L (ppt)
10/1/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 7.9 NG/L (ppt)
10/1/2025
Perfluorobutanoicacid (PFBA)
Detected: 3.8 NG/L (ppt)
10/1/2025
Perfluoropentanoicacid (PFPEA)
Detected: 9.7 NG/L (ppt)
10/1/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 4.8 NG/L (ppt)
10/1/2025
Turbidity
Detected: 1.3 NTU
9/19/2025
A measure of water cloudiness from suspended particles.
Radium-226
Detected: 0.34 PCI/L
1/6/2025
Radium-228
Detected: 0.072 PCI/L
9/19/2025
Odor
Detected: 1 TON
9/19/2025
Conductivity (at 25°C)
Detected: 900 UMHO/CM
9/19/2025
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.