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Class A Drinking, cooking, contact recreation (swimming), fishing, fish propagation and survival
(aquatic life).
Class B Primary and secondary contact recreation, fishing, fish propagation and survival (aquatic life).
Class C Fishing, fish propagation and survival (aquatic life). Can be suitable for contact recreation,
but may be limited.
Class D Fishing. Cannot support fish propagation due to natural conditions such as streambed and
flow. Suitable for fish survival. Contact recreation may be limited.
Parameter | Oligotrophic | Mesotrophic | Eutrophic |
Total Phosphorus (μg/l) | <10 | 10-20 | >20 |
Chlorophyll a (μg/l) | <4 | 4-10 | >10 |
Secchi Disk Depth (m) | >4 | 2-4 | <2 |
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At Community Science Institute (CSI), environmental education is a core part of
The Power of Community-Collected Data: how CSI’s data have been used to