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 that deliver stormwater into the ocean.

Current Results

The following beaches are posted: North Mad River Mouth

Water quality test results by location and date.
Locations Resample Sample  Date 
E.Coli Exceeds
Enterococcus Exceeds
Clam Beach County Park No 7/15/2019 1,576 No 20 No 20 No
Luffenholtz Creek No 7/15/2019 238 No 20 No 31 No
Moonstone Beach No 7/15/2019 10 No <10 No <10 No
North Mad River Mouth No 7/15/2019 41 No <10 No
7,701 Yes
Trinidad State Park / Mill Creek No 7/15/2019 <10 No <10 No <10 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

NOWCAST Predictions

NOWCAST Predictive Modeling now includes Luffenholtz Beach. Click the website and enter "Luffenholtz" under the "search for your favorite beach" section.

For more information, go to: https://beachreportcard.org.