For a more interactive version of this (and previous years) data or to download raw data files, please visit the Interactive Sandusky Bay Data Viewer. For comments, questions, or issues, please email .

Sampling Date

Year to Date

Toxin Data

US EPA recommended threshold for recreational Microcystin concentrations is a maximum of 8 µg/L. More information about the EPA recommended criteria for Microcystin concentrations can be found here.

Environmental Data

Chlorophyll Data

Fluoroprobe Data

Total Suspended Solids

Saxitoxin Data

Based on the US EPA’s recreational swimming advisories for Saxitoxins, public health advisories are issued stating that water contact should be avoided when saxitoxin exceeds 0.8 µg/L. At concentrations of >3.0 µg/L a No Contact advisory is issued stating that all contact with water and aerosols should be avoided. More information about the EPA recommended criteria for Saxitoxin concentrations can be found here.

6/3/2025

Environmental Data Parameters

Fluoroprobe Data

Data sourced from a BBE fluoroprobe for phytoplankton biomass estimates. These values are estimates of the approximate concentrations of these particular phytoplankton.

Chlorophyll Data

Values for total chlorophyll-a extracted using DMSO in ug/L.

Toxin Data

Total Suspended Solids

6/10/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

ggplot(df_filtered_6.10, aes(x = Site, y = TSS)) +
  geom_bar(stat = "identity", fill = "brown") +
  labs(title = "Total Suspended Solids by Site - 6/10/2025",
       x = "Site",
       y = "Total Suspended Solids (mg/L)") +
  theme(axis.text.x = element_text(angle = 45, hjust = 1))
## Warning: Removed 1 row containing missing values or values outside the scale range
## (`geom_bar()`).

6/17/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

6/24/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

7/1/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

7/8/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

7/15/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

7/22/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

7/29/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

8/5/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

8/12/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

8/20/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

8/26/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

9/2/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

9/9/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids

9/16/2025

Environmental Data

Fluoroprobe Data

Chlorophyll Data

Toxin Data

Total Suspended Solids