Lily Pond
Worcester County, MassachusettsView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Oligotrophic
- Impaired · Algal growth
- #7 of 24 in the county
- Limited data
Lily Pond in Worcester County, Massachusetts has a water quality grade of A (Excellent). Chlorophyll-a (algae): 1.7 µg/L.
- Type
- Oligotrophic
- Chlorophyll-a
- 1.7 µg/L
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Watch Lily Pond’s letter
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Lily Pond is a cold, clear oligotrophic lake in Worcester County, Massachusetts. Water quality is graded A based on 1 sampling years through 2017. Compared to the 23 other monitored lakes in Worcester County, Lily Pond ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2017-09-12. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
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 A is nutrients and algae, not a swimming clearance. Lily Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, mercury, nuisance exotic species. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
No clarity data. Chlorophyll-a 1.7 µg/L. TSI 36. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 1.7 µg/L | Good |
| Trophic State Index (TSI) | 36 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Lily Pond
EPA Impairment Status
Lily Pond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MA81147 · Official waterbody report · Matched by proximity (2.36 km)
County Ranking
Ranked #7 of 24 lakes in Worcester County
Nearby Lakes in Worcester County
Frequently asked questions about Lily Pond
Where is Lily Pond?
- Lily Pond is a lake in Worcester County, Massachusetts. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lily Pond?
- Lily Pond in Worcester County, Massachusetts has a water quality grade of A (Excellent). Chlorophyll-a (algae): 1.7 µg/L.
Is Lily Pond safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Lily Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, mercury, nuisance exotic species. Check local advisories before you swim.
Explore Lily Pond across LakeQuality
Species activity outlook by water temperature and season
Where to stay at Massachusetts's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
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Other Grade A Lakes in Massachusetts
Oligotrophic Lakes in Massachusetts
Where this data comes from
3 measurements from 1 monitoring station, 2017. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Massachusetts Department of Environmental Protection (MassDEP)
MASSDEP3 samples · 2017
Analytical methods
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database