Johns River at a Glance
The Department of Environmental Protection's (DEP) River at a Glance
report provides the public with information on water quality in the St.
Johns River. Since April of 1997, DEP's Northeast District has sampled
the River in Duval County and later expanded this effort to include
stations in Clay and Putnam counties.
evaluate water quality
along the St. Johns by conducting monthly sampling at four stations.
Approved scientific techniques are used to measure a number of different
chemical, physical, and biological characteristics. These results are
compared with standards that
scientists believe reflect a healthy water body.
Since environmental factors can change
quickly, scientists dubbed the survey "River at a Glance" to emphasize that
the sample results represent a monthly snapshot of the St. Johns River.
River at a Glance is intended to monitor
water quality and draw conclusions on the influence of environmental
If water quality drops below the safe mark for swimming or fishing activities, the
Department of Health would
issue appropriate warnings.
River At a Glance STORET Retrieval
Sample Runs - All sites are sampled bi-monthly. Each month
four of the eight sites are sampled. This is done on 2 tracks,
A and B, listed in the table above. Track A sites are done
in odd months and Track B sites are done in even months. BOD, coliforms,
TSS, VSS, color, turbidity and the in-situ measurements, dissolved
oxygen, pH, conductivity, temperature, salinity, and Secchi depth
are studied during every sampling event. Nutrients are done every
other sampling event; therefore, nutrients are done at each site
every 4 months while all other parameters are done bi-monthly.