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 beach is currently posted : Clam Beach/Strawberry Creek.
Locations Resample Sample  Data 
E.Coli Exceeds
Enterococcus Exceeds
Clam Beach County Park Yes 10/20/2016 2,595 No 546 Yes* 10 No
Moonstone Beach Yes 10/20/2016 985 No 10 No 10 No
North Mad River Mouth Yes 10/20/2016 63 No 30 No <10 No
Clam Beach County Park No 10/19/2016 1,850 No 364 Yes* 51 No
Luffenholtz Creek No 10/19/2016 2,613 No 20 No 62 No
Moonstone Beach No 10/19/2016 24,196 Yes 323
No 199 Yes
North Mad River Mouth No 10/19/2016 5,172 No 110 No
135 Yes
Trinidad State Park / Mill Creek No 10/19/2016 3,654 No 52 No 31 No
Previous results are available for download.


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