Rumsey Slough Mouth Lake
Lake County, CaliforniaView mapDirections
SWRCB publishes the water-quality measurements for Rumsey Slough Mouth Lake. Here is what has been measured.
- Limited data
Rumsey Slough Mouth Lake in Lake County, California has water-quality measurements published by SWRCB, shown here as reported. Water clarity: 1.6 ft visibility. Chlorophyll-a (algae): 7.2 µg/L.
Rumsey Slough Mouth Lake is a lake in Lake County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2026-04-30. 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 Rumsey Slough Mouth 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 Rumsey Slough Mouth Lake
These are the measurements SWRCB publishes for Rumsey Slough Mouth Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1.6 ft of visibility. Chlorophyll-a 7.2 µg/L. TSI 60.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | 7.2µg/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. | 60 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about Rumsey Slough Mouth Lake
Where is Rumsey Slough Mouth Lake?
- Rumsey Slough Mouth 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 Rumsey Slough Mouth Lake?
- Rumsey Slough Mouth Lake in Lake County, California has water-quality measurements published by SWRCB, shown here as reported. Water clarity: 1.6 ft visibility. Chlorophyll-a (algae): 7.2 µg/L.
Is Rumsey Slough Mouth 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
88 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Big Valley Band of Pomo Indians of the Big Valley Rancheria, California (Tribal)
CA_BVR88 samples · 2020–2026
Analytical methods
- Chlorophyll a
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.