Waller Mill Reserv Sta Lake
York County, VirginiaView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
- Eutrophic
- #5 of 7 in the county
Waller Mill Reserv Sta Lake in York County, Virginia has a water quality grade of B (Good). Water clarity: 3.9 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 11.1 µg/L.
- Clarity
- 3.9 ft
- Type
- Eutrophic
- Phosphorus
- 30 µg/L
- Chlorophyll-a
- 11.1 µg/L
- Trend
- ↓ Declining
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Watch Waller Mill Reserv Sta Lake’s letter
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Waller Mill Reserv Sta Lake is a productive, nutrient-rich eutrophic lake in York County, Virginia. Water quality is graded B based on 2 sampling years through 2025. Overall water quality is declining over recent sampling years. Compared to the 6 other monitored lakes in York County, Waller Mill Reserv Sta Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Virginia DEQ, last sampled 2025-09-25. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: B (Good)
Murky, only visible to about 3.9 ft. Phosphorus 30 µg/L. Chlorophyll-a 11.1 µg/L. TSI 55. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.9 ft | Not graded |
| Phosphorus | 30 µg/L | Good |
| Chlorophyll-a (Algae) | 11.1 µg/L | Good |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Waller Mill Reserv Sta Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.005 m/yr | 5 |
| Phosphorus | → Stable | -0.33 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +0.27 µg/L/yr | 5 |
County Ranking
Ranked #5 of 7 lakes in York County
Nearby Lakes With Higher Grades
Waller Mill Reserv Sta Lake holds Grade B. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in York County
Frequently asked questions about Waller Mill Reserv Sta Lake
Where is Waller Mill Reserv Sta Lake?
- Waller Mill Reserv Sta Lake is a lake in York County, Virginia. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Waller Mill Reserv Sta Lake?
- Waller Mill Reserv Sta Lake in York County, Virginia has a water quality grade of B (Good). Water clarity: 3.9 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 11.1 µg/L.
Is Waller Mill Reserv Sta Lake safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Waller Mill Reserv Sta Lake across LakeQuality
More Virginia Lake Rankings
Other Grade B Lakes in Virginia
Eutrophic Lakes in Virginia
Where this data comes from
147 measurements from 1 monitoring station, 2013–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY
21VASWCB147 samples · 2013–2025
Analytical methods
- Tyler, John. 1968. The secchi disk, Limnology and Oceanograpy, 13(1):1-6.
- Total Phosphorus After Block Digestion
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 2130 B ~ Nephelometric Method
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.