Serving roughly 20,875 people in Humboldt County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for ARCATA, CITY OF
1 water provider directly on file, serving roughly 20,875 people in Humboldt County, California.
Quick answer: ARCATA, CITY OF has no violations on file. One reading is worth knowing about: Lead was measured at 19UG/L, among the highest of the 250 providers on file in this area. It's the most notable figure in this system's record among its 250 local peers.
Lead Summary
Copper Summary
TTHM
Totalhaloaceticacids (HAA5)
Lead
Chloroform
Bromodichloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromochloromethane
Copper, Free
Utility ARCATA, CITY OFPopulation served 20,875Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.00364 mg/L (ppm)
12/31/2025
Copper Summary
Detected: 1.5 mg/L (ppm)
12/31/1993
Lead
Detected: 19 UG/L (ppb)
9/10/2025
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: 730 UG/L (ppb)
9/12/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 7.6 UG/L (ppb)
7/30/2025
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.
Totalhaloaceticacids (HAA5)
Detected: 7.5 UG/L (ppb)
7/30/2025
Chloroform
Detected: 4.6 UG/L (ppb)
7/30/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 1.8 UG/L (ppb)
7/30/2025
Dibromochloromethane
Detected: 1.2 UG/L (ppb)
7/30/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 3.4 UG/L (ppb)
7/30/2025
Trichloroaceticacid
Detected: 4.1 UG/L (ppb)
7/30/2025
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.