Billerica Impoundment Lake
Middlesex County, Massachusetts9 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Impaired · Algal growth
- Limited data
Billerica Impoundment Lake in Middlesex County, Massachusetts is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 68.6 µg/L. Surface area: 8.6 acres.
- Area
- 9 acres
- Chlorophyll-a
- 68.6 µg/L
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Watch Billerica Impoundment Lake’s letter
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Why Billerica Impoundment Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Billerica Impoundment Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded algae (chlorophyll-a), but not water clarity and phosphorus.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by MassDEP and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Billerica Impoundment Lake is a 9-acre lake in Middlesex County, Massachusetts.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2012-08-20. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Billerica Impoundment Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, noxious aquatic plants, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), turbidity. Check local advisories before you swim.
Water quality measurements for Billerica Impoundment Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Chlorophyll-a 68.6 µg/L. TSI 72.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 68.6 µg/L | Not graded |
| Trophic State Index (TSI) | 72 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 9 acres |
No bathymetric survey has been published for Billerica Impoundment Lake, so its depth is not documented here.
Fishing Billerica Impoundment Lake
Reservoir Info (USACE NID)
Billerica Impoundment Lake is a man-made reservoir impounded by the Talbot Mills Dam (completed 1828), built primarily for flood risk reduction on the Concord River; masonry-type dam, 16 ft tall and 316 ft long.
- Surface area
- 8.6 ac
- Normal storage
- 110 ac-ft
- Max storage
- 162 ac-ft
- Drainage area
- 370 sq mi
- Hazard class
- Significant
- Owner
- CRT Development Realty, LLC
All listed purposes: Flood Risk Reduction;Recreation.
Source: USACE National Inventory of Dams, NID ID MA00774 · Operator website · Matched by proximity (0.09 km)
EPA Impairment Status
Billerica Impoundment Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MA83010 · Official waterbody report · Matched by proximity (2.75 km)
Graded lakes near Billerica Impoundment Lake
Billerica Impoundment Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Middlesex County
Frequently asked questions about Billerica Impoundment Lake
Where is Billerica Impoundment Lake?
- Billerica Impoundment Lake is a lake in Middlesex County, Massachusetts. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Billerica Impoundment Lake?
- Billerica Impoundment Lake in Middlesex County, Massachusetts is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 68.6 µg/L. Surface area: 8.6 acres.
Is Billerica Impoundment Lake safe to swim in?
- The letter is not a swimming clearance. Billerica Impoundment Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, noxious aquatic plants, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), turbidity. Check local advisories before you swim.
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Where this data comes from
1 measurement from 1 monitoring station, 2012. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- OARS - For the Assabet Sudbury & Concord Rivers (Volunteer)
OARS1 sample · 2012
Analytical methods
- 10200 H ~ Chlorophyll a-b-c Determination
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