Serving roughly 444,800 people in Orange County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for IRVINE RANCH WATER DISTRICT
1 water provider directly on file, serving roughly 444,800 people in Orange County, California.
Quick answer: IRVINE RANCH WATER DISTRICT has no violations on file. One reading is worth knowing about: Chromium, Hex was measured at 0.57UG/L, among the highest of the 167 providers on file in this area. It's the most notable figure in this system's record among its 167 local peers.
Lead Summary
Lithium
PFBA
PFPEA
Magnesium
Potassium
Sodium
Calcium
Hardness, Total (ASCACO3)
Bromide
Alkalinity, Bicarbonate
Alkalinity, Total
TDS
Sulfate
Chloride
Fluoride
Nitrite
Nitrate-Nitrite
Nitrate
Carbon, Total
Silica
Turbidity
pH
Vanadium, Total
Iron
Nickel
Chromium
Barium
Arsenic
Selenium
Copper, Free
Aluminum
Boron, Total
TTHM
Chromium, Hex
Chloroform
Bromodichloromethane
1, 4-Dioxane
Manganese
Zinc
Dichloroaceticacid
Trichloroaceticacid
Monochloroaceticacid
Conductivity (at 25°C)
Color
Totalhaloaceticacids (HAA5)
Utility IRVINE RANCH WATER DISTRICTPopulation served 444,800Owner Local 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)
12/31/2025
Vanadium, Total
Detected: 4 UG/L (ppb)
7/29/2025
Iron
Detected: 12 UG/L (ppb)
7/29/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Nickel
Detected: 2.3 UG/L (ppb)
7/29/2025
Chromium
Detected: 1.6 UG/L (ppb)
7/29/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Barium
Detected: 56 UG/L (ppb)
7/29/2025
Arsenic
Detected: 1.7 UG/L (ppb)
7/29/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Selenium
Detected: 2 UG/L (ppb)
7/29/2025
Copper, Free
Detected: 2.2 UG/L (ppb)
7/29/2025
Aluminum
Detected: 5.6 UG/L (ppb)
5/29/2025
Chromium, Hex
Detected: 0.57 UG/L (ppb)
5/20/2025
Manganese
Detected: 7.3 UG/L (ppb)
7/29/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Zinc
Detected: 5.8 UG/L (ppb)
7/29/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 0.5 UG/L (ppb)
7/29/2025
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: 0.5 UG/L (ppb)
7/29/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 0.8 UG/L (ppb)
2/26/2025
Totalhaloaceticacids (HAA5)
Detected: 8.45 UG/L (ppb)
1/8/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 78.1 MG/L (ppm)
7/29/2025
Chloride
Detected: 36.9 MG/L (ppm)
7/29/2025
Fluoride
Detected: 0.3 MG/L (ppm)
7/29/2025
Often added deliberately for dental health; can also occur naturally.
Nitrite
Detected: 0.006 MG/L (ppm)
7/29/2025
Nitrate-Nitrite
Detected: 0.94 MG/L (ppm)
10/7/2025
Nitrate
Detected: 0.94 MG/L (ppm)
10/7/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Boron, Total
Detected: 190 UG/L (ppb)
5/20/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 12.8 MG/L (ppm)
7/29/2025
Potassium
Detected: 1.9 MG/L (ppm)
7/29/2025
Sodium
Detected: 46 MG/L (ppm)
7/29/2025
Calcium
Detected: 57.7 MG/L (ppm)
7/29/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 197 MG/L (ppm)
7/29/2025
pH
Detected: 8 PH
7/29/2025
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
Lithium
Detected: 12.4669 µg/L (ppb)
7/15/2025
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFBA
Detected: 0.0079 µg/L (ppb)
7/15/2025
PFPEA
Detected: 0.0038 µg/L (ppb)
7/15/2025
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Bromide
Detected: 0.11 MG/L (ppm)
7/29/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 193 MG/L (ppm)
7/29/2025
Other
Additional substances tested that don't fit neatly into the categories above
Alkalinity, Total
Detected: 159 MG/L (ppm)
7/29/2025
TDS
Detected: 354 MG/L (ppm)
7/29/2025
Carbon, Total
Detected: 0.13 MG/L (ppm)
7/29/2025
Silica
Detected: 19.1 MG/L (ppm)
7/15/2025
Turbidity
Detected: 0.2 NTU
7/29/2025
A measure of water cloudiness from suspended particles.
1, 4-Dioxane
Detected: 2.99 UG/L (ppb)
9/23/2025
Dichloroaceticacid
Detected: 1.5 UG/L (ppb)
5/1/2025
Trichloroaceticacid
Detected: 9.4 UG/L (ppb)
5/1/2025
Monochloroaceticacid
Detected: 2.6 UG/L (ppb)
5/1/2025
Conductivity (at 25°C)
Detected: 569 UMHO/CM
7/29/2025
Color
Detected: 7 UNITS
9/30/2025
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.