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

No beaches are currently posted.

Water quality test results by location and date.
Locations Resample Sample  Date 
Total
Coliform
Exceeds
Limit
E.Coli Exceeds
Limit
Enterococcus Exceeds
Limit
Clam Beach County Park No 8/19/2019 3,076 No 158 No 75 No
Luffenholtz Creek No 8/19/2019 960 No 20 No 85 No
Moonstone Beach No 8/19/2019 156 No 96 No 20 No
North Mad River Mouth No 8/19/2019 75 No 75 No
<10 No
Trinidad State Park / Mill Creek No 8/19/2019 2,481 No <10 No 10 No

Legend

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. Visit and enter "Luffenholtz" into the "search for your favorite beach" form field.

For more information, visit .