Back Water Pond
Imperial County, CaliforniaView mapDirections
SWRCB publishes the water-quality measurements for Back Water Pond. Here is what has been measured.
- Limited data
Back Water Pond in Imperial County, California has water-quality measurements published by SWRCB, shown here as reported. Phosphorus: 62 µg/L.
Back Water Pond is a lake in Imperial County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-09-03. 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 Back Water Pond 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 Back Water Pond
These are the measurements SWRCB publishes for Back Water Pond, 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 62 µg/L. TSI 64.
| 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 | 62µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading 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. | 64 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Answers come straight from the public measurements and survey records on this page.
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Frequently asked questions about Back Water Pond
Where is Back Water Pond?
- Back Water Pond is a lake in Imperial County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Back Water Pond?
- Back Water Pond in Imperial County, California has water-quality measurements published by SWRCB, shown here as reported. Phosphorus: 62 µg/L.
Is Back Water Pond 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
40 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Quechan Tribe of the Fort Yuma Indian Reservation, California & Arizona (Tribal)
QUECHAN_WQX40 samples · 2020–2025
Analytical methods
- Phosphorus by Two Reagent Colorimetry
- Turbidity by Nephelometry
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.