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
North Mad River Mouth No 10/18/2021 30 No 10 No 10 No
Clam Beach County Park No 10/26/2021 1,679 No 31 No 41 No
Moonstone Beach Yes 11/03/2021 108 No <10 No 41 No
Luffenholtz Creek Yes 10/28/2021 605 No 31 No 52 No
Trinidad State Park / Mill Creek Yes 10/28/2021 1,246 No 10 No 63 No

Previous results are available for download (XLS).

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

For more information, visit beachreportcard.org.