JOINT REGIONAL WATER SUPPLY SYSTEM Water Quality Report
Serving roughly 3,947 people in Orange County, California.
Data current as of July 2026
🔍Straight from EPA
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Results for JOINT REGIONAL WATER SUPPLY SYSTEM
1 water provider directly on file, serving roughly 3,947 people in Orange County, California.
Quick answer: JOINT REGIONAL WATER SUPPLY SYSTEM has no violations on file. One reading is worth knowing about: Bromodichloromethane was measured at 16.9UG/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
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Utility JOINT REGIONAL WATER SUPPLY SYSTEMPopulation served 3,947Owner Local government
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0059 mg/L (ppm)
12/31/2024
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 18.4 UG/L (ppb)
9/8/2025
TTHM
Detected: 49.3 UG/L (ppb)
9/8/2025
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: 15.3 UG/L (ppb)
9/8/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 4.19 UG/L (ppb)
9/8/2025
Bromodichloromethane
Detected: 16.9 UG/L (ppb)
9/8/2025
Dibromochloromethane
Detected: 13 UG/L (ppb)
9/8/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 8.94 UG/L (ppb)
9/8/2025
Trichloroaceticacid
Detected: 7.62 UG/L (ppb)
9/8/2025
Dibromoaceticacid
Detected: 1.86 UG/L (ppb)
9/8/2025
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.