Water Quality Test Results

Ocean Monitoring

Humboldt County is funded by the U.S. Environmental Protection Agency Beach Environmental Assessment and Coastal Health Act (BEACH Act) to monitor for the presence of bacteria in ocean water areas. Water samples are taken near creek mouths (PDF) that deliver stormwater into the ocean.

Current Results

The following beach is posted: Luffenholtz Beach
Water quality test results by location and date.
Locations Resample Sample  Data 
E.Coli Exceeds
Enterococcus Exceeds
Clam Beach County Park No 7/24/2017 63
No <10 No <10 No
Luffenholtz Creek No 7/24/2017 2,613
No 160 No 231 Yes
Moonstone Beach No 7/24/2017 <10 No <10
No <10 No
North Mad River Mouth No 7/24/2017 85 No <10 No
<10 No
Trinidad State Park / Mill Creek No 7/24/2017 272 No 52 No 98 No
Previous results are available for download (XLS).


All units are in are in MPN/100 ml. MPN = "most probable number".
State water quality standards for bacteria in recreational waters are not to exceed:
Total coliform = 10,000 MPN/100ml
E. coli (a fecal coliform) = 400 MPN/100 ml
Enterococcus (E. faecalis) = 104 MPN/100 ml
*Fecal coliform to total coliform ratio exceeds 0.1, and the total coliform count exceeds 1,000 MPN