Serving roughly 15,701 people in San Bernardino County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for US ARMY FORT IRWIN
1 water provider directly on file, serving roughly 15,701 people in San Bernardino County, California.
Quick answer: US ARMY FORT IRWIN has no violations on file. One reading is worth knowing about: Fluoride was measured at 4.2MG/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
Lithium
TDS
Fluoride
Arsenic
Conductivity (at 25°C)
TTHM
Bromoform
Dibromochloromethane
Chloroform
Bromodichloromethane
Boron, Total
Magnesium
Potassium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Alkalinity, Carbonate
Hardness, Total (ASCACO3)
Sulfate
Chloride
Nitrate
Turbidity
Combined Uranium
Utility US ARMY FORT IRWINPopulation served 15,701Owner Federal government
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2024
Arsenic
Detected: 11 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.
Combined Uranium
Detected: 7.58 PCI/L
4/30/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 15 UG/L (ppb)
7/23/2025
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.
Bromoform
Detected: 7.1 UG/L (ppb)
7/23/2025
Dibromochloromethane
Detected: 4.6 UG/L (ppb)
7/23/2025
Chloroform
Detected: 1.1 UG/L (ppb)
7/23/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 2.2 UG/L (ppb)
7/23/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Fluoride
Detected: 4.2 MG/L (ppm)
10/21/2025
Often added deliberately for dental health; can also occur naturally.
Boron, Total
Detected: 940 UG/L (ppb)
10/7/2025
Sulfate
Detected: 89 MG/L (ppm)
3/19/2025
Chloride
Detected: 56 MG/L (ppm)
3/19/2025
Nitrate
Detected: 1 MG/L (ppm)
4/17/2025
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: 2.6 MG/L (ppm)
3/19/2025
Potassium
Detected: 2.1 MG/L (ppm)
3/19/2025
Sodium
Detected: 160 MG/L (ppm)
3/19/2025
Calcium
Detected: 4.9 MG/L (ppm)
3/19/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 23 MG/L (ppm)
3/19/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 11 µg/L (ppb)
1/31/2025
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 180 MG/L (ppm)
3/19/2025
Alkalinity, Carbonate
Detected: 6.2 MG/L (ppm)
3/19/2025
Other
Additional substances tested that don't fit neatly into the categories above
TDS
Detected: 450 MG/L (ppm)
10/21/2025
Conductivity (at 25°C)
Detected: 770 UMHO/CM
10/21/2025
Alkalinity, Total
Detected: 190 MG/L (ppm)
3/19/2025
Turbidity
Detected: 0.52 NTU
3/19/2025
A measure of water cloudiness from suspended particles.
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.