Herman Impoundment Lake
Lake County, CaliforniaView mapDirections
SWRCB publishes the water-quality measurements for Herman Impoundment Lake. Here is what has been measured.
- Limited data
Herman Impoundment Lake in Lake County, California has water-quality measurements published by SWRCB, shown here as reported. Phosphorus: 3 µg/L. Chlorophyll-a (algae): 1.5 µg/L.
Herman Impoundment Lake is a lake in Lake County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-05-02. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Herman Impoundment Lake is safe to swim in today is a call for the California State Water Resources Control Board and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Herman Impoundment Lake
These are the measurements SWRCB publishes for Herman Impoundment Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 3 µg/L. Chlorophyll-a 1.5 µg/L. TSI 27.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 3µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 1.5µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 27 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
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Frequently asked questions about Herman Impoundment Lake
Where is Herman Impoundment Lake?
- Herman Impoundment Lake is a lake in Lake County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Herman Impoundment Lake?
- Herman Impoundment Lake in Lake County, California has water-quality measurements published by SWRCB, shown here as reported. Phosphorus: 3 µg/L. Chlorophyll-a (algae): 1.5 µg/L.
Is Herman Impoundment Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
6 measurements from 1 monitoring station, 2022–2023. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- USGS California Water Science Center
USGS-CA6 samples · 2022–2023
Analytical methods
- P, wu, WCA, persulfate CF color
- Plant pigments, sonication & 445
- YSI Environmental, sensor 6136
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.