Pardee Reservoir North Arm
Amador County, CaliforniaView mapDirections
SWRCB publishes the water-quality measurements for Pardee Reservoir North Arm. Here is what has been measured.
- Impaired · Mercury
- Limited data
Pardee Reservoir North Arm in Amador County, California has water-quality measurements published by SWRCB, shown here as reported. Phosphorus: 4 µg/L. Chlorophyll-a (algae): 0.8 µg/L.
Pardee Reservoir North Arm is a lake in Amador County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-08-08. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Pardee Reservoir North Arm is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Pardee Reservoir North Arm 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 Pardee Reservoir North Arm
These are the measurements SWRCB publishes for Pardee Reservoir North Arm, 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 4 µg/L. Chlorophyll-a 0.8 µg/L. TSI 26.
| 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 | 4µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 0.8µg/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. | 26 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
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Fishing Pardee Reservoir North Arm
EPA Impairment Status
Pardee Reservoir North Arm is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption, Other.
Source: EPA ATTAINS assessment unit CAL5326009120000208163748 · Official waterbody report
Nearby Lakes in Amador County
Frequently asked questions about Pardee Reservoir North Arm
Where is Pardee Reservoir North Arm?
- Pardee Reservoir North Arm is a lake in Amador County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Pardee Reservoir North Arm?
- Pardee Reservoir North Arm in Amador County, California has water-quality measurements published by SWRCB, shown here as reported. Phosphorus: 4 µg/L. Chlorophyll-a (algae): 0.8 µg/L.
Is Pardee Reservoir North Arm safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Pardee Reservoir North Arm is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
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Where this data comes from
2 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- USGS California Water Science Center
USGS-CA2 samples · 2023
Analytical methods
- Nutrients, wu, persulfate, color
- Pigments, algae, EPA445.0 w/ACTN
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database