Serving roughly 7,825 people in Siskiyou County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for YREKA, CITY OF
1 water provider directly on file, serving roughly 7,825 people in Siskiyou County, California.
Quick answer: YREKA, CITY OF currently has an open health-based violation on file: Lead And Copper Rule Revisions, a compliance issue since 10/17/2024. This is active, not historical — see the violation detail below for what EPA's enforcement record shows.
Lead Summary
Totalhaloaceticacids (HAA5)
TTHM
Lead
Chloroform
Bromodichloromethane
Dichloroaceticacid
Trichloroaceticacid
Copper, Free
Perfluorobutanesulfonicacid (PFBS)
Perfluoroctanesulfonicacid (PFOS)
Carbon, Total
Nitrate
Barium
Aluminum
Utility YREKA, CITY OFPopulation served 7,825Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0006 mg/L (ppm)
12/31/2025
Lead
Detected: 0.6 UG/L (ppb)
9/18/2025
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: 8.55 UG/L (ppb)
9/18/2025
Barium
Detected: 3 UG/L (ppb)
8/12/2025
Aluminum
Detected: 79.5 UG/L (ppb)
8/12/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 27 UG/L (ppb)
8/12/2025
TTHM
Detected: 33 UG/L (ppb)
8/12/2025
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: 31 UG/L (ppb)
8/12/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 1.4 UG/L (ppb)
8/12/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 0.11 MG/L (ppm)
8/12/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 10 UG/L (ppb)
8/12/2025
Trichloroaceticacid
Detected: 17 UG/L (ppb)
8/12/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 3 NG/L (ppt)
6/19/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 3.3 NG/L (ppt)
6/19/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Carbon, Total
Detected: 2.2 MG/L (ppm)
2/27/2025
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.