New Hampshire reservoir · state assessment record
Robinson Pond
Assessment decisions reported by New Hampshire to EPA under Clean Water Act sections 303(d) and 305(b), last assessed in the 2024 reporting cycle.
- 128
- Assessed acres
- Lake / Reservoir / Pond
- Water type
This waterbody in one line
Robinson Pond, a reservoir in New Hampshire, is assessed as not supporting one or more designated uses, with 8 listed impairment causes in the state's most recent Integrated Report cycle (2024). By assessed acreage it sits above the national median by assessed acreage (38,628 lakes); its impairment list is among the longest nationally (8 listed causes vs 23,610 assessed lakes). Aquatic life is assessed as not supporting. Fish consumption is assessed as not supporting.
- Not Supporting
- overall status
- P74
- Assessed size nationally
- P0
- Shorter cause list
- Not Supporting
- aquatic life
Assessment verdicts are the state agency's decisions as reported to EPA ATTAINS; PlainLakes renders them without modification.
A composite of this record's EPA ATTAINS designated-use verdicts, filed impairment count, and assessment currency, weighted and benchmarked against the national corpus of assessed active waterbodies. This is a water-quality standing, not a human-recreation or property-value judgment, and dimensions with no filed verdict drop out rather than count against the score.
Reading Robinson Pond's filed record
Paragraphs are selected by this unit's percentiles and use matrix: different lakes lead with different dimensions. Figures are ATTAINS / portal register arithmetic, not advice.
The signature stat: in-state cause rank
Inside New Hampshire, cause-list rank is the local separator: Robinson Pond is 4 of 2,233 indexed units by listed-cause count, toward the top of that state's filed lists.
Longer than most cause lists
8 listed causes puts this unit above 99% of assessed lake-type records by list length. Treat that as a coding-and-sampling signal: states that split pollutants finely mint longer lists without proving worse water.
No ruled-on use clears the bar
On the uses this filer ruled on, fish consumption, recreation, aquatic life, every determination is Not Supporting. That is a use-by-use reading of the filed record, not a single overall lake grade.
Robinson Pond: Category 4A reading
Category 4A means a TMDL (or equivalent) is already approved for the impairment on Robinson Pond. The remaining work is implementation and tracking, read the cleanup-standing and cause rows for what the state already committed to address.
Large within New Hampshire
Among New Hampshire's 2,233 indexed units with an area, Robinson Pond ranks 192 by assessed size, toward the large end of that state file.
According to the U.S. Environmental Protection Agency's ATTAINS program, New Hampshire carries 2,786 filed lake-type waterbodies in the August 2026 extract, and this page renders the assessment record EPA assigned to Robinson Pond without modification. See our methodology for reporting-unit limits and gauge linking rules.
The record
Designated-use assessments
Fully Supporting and Not Supporting are the state's definitive verdicts; other entries mean the use was not conclusively assessed in this cycle. The latest monitoring New Hampshire filed against this record runs through 2023. For the definitive verdicts on this record, New Hampshire filed the assessment basis as Monitored Data. Those are EPA's own words, not PlainLakes' summary of them.
| Designated use | Group | Verdict |
|---|---|---|
| Aquatic Life Integrity | Aquatic-life or related | Not Supporting |
| Fish Consumption | Fish-consumption or fishery | Not Supporting |
| Potential Drinking Water Supply | Drinking-water supply designation | Fully Supporting |
| Primary Contact Recreation | Recreation | Not Supporting |
| Secondary Contact Recreation | Recreation | Fully Supporting |
The record
Listed impairment causes
Causes the state listed as impairing designated uses of this reservoir, with the cycle each was first listed and the Clean Water Act action recorded against it.
| Cause | Affected uses | First listed | Cleanup standing |
|---|---|---|---|
| Mercury - Fish Consumption Advisory | Fish Consumption | 2002 | TMDL approved |
| Non-Native Aquatic Plants | Aquatic Life Integrity | 2002 | None reported |
| Chlorophyll-a | Primary Contact Recreation, Aquatic Life Integrity | 2004 | TMDL approved |
| Cyanobacteria Hepatotoxic Microcystins | Primary Contact Recreation | 2006 | TMDL approved |
| Dissolved Oxygen Saturation | Aquatic Life Integrity | 2006 | TMDL approved |
| pH | Aquatic Life Integrity | 2006 | TMDL approved |
| Escherichia coli (E. coli) | Primary Contact Recreation Also assessed as meeting: Secondary Contact Recreation, Potential Drinking Water Supply | 2008 | TMDL approved |
| Phosphorus, Total | Aquatic Life Integrity | 2010 | TMDL approved |
Reading the record
Robinson Pond: Category 4A reading
4A Category 4A: impaired, TMDL completed
New Hampshire filed this assessment unit as Category 4A: impaired, with a pollutant-budget TMDL already completed under 303(d). The listing remains an impairment finding; the plan is on file rather than still awaiting write-up.
Scale and rank
Robinson Pond is one of 2,786 lake-type waterbodies reported to EPA from New Hampshire, and one of 2,233 whose reported record carries enough populated assessment or gauge data for this site to list and index it. At 128 assessed acres it ranks 9,908th by assessed size among the 38,628 lakes the dataset carries an area for, counting a state’s repeated filings of one water once, behind 9,907 lakes with a larger one.
In context
Where Robinson Pond sits nationally
Assessed size among U.S. lakes
Distribution of assessed acreage across ATTAINS lakes filed with an area, counting a state’s repeated filings of one water once
128 Top 26% larger than 74% of 38,628 lakes
lakes the dataset carries an area for, counting a state’s repeated filings of one water once, bucketed by value
Source EPA ATTAINS · Reporting cycles 1987–2026
Listed causes vs waterbodies carrying a verdict
How many impairment causes U.S. waterbodies with a reported verdict carry
8 Longer than most more listed causes than 99% of 23,610 waterbodies carrying a verdict
named waterbodies carrying a verdict, bucketed by value
Source EPA ATTAINS · Reporting cycles 1987–2026
In both charts each bar is a band and taller bars hold more waterbodies; the dashed line and filled bar mark Robinson Pond. Hover or tap any bar for its full count and share.
In context
New Hampshire context
ATTAINS carries 2,786 lake-type waterbodies in New Hampshire, 2,783 assessed as not supporting at least one use and 0 fully supporting. Among the 2,233 indexed units there, Robinson Pond ranks 4th by listed-cause count (8 listed causes) and 192nd by assessed size among the 2,233 with an area filed; it sits in the not-supporting set (2,783 statewide) . Its listed causes include Mercury - Fish Consumption Advisory, Cyanobacteria Hepatotoxic Microcystins, Dissolved Oxygen Saturation, pH, and Escherichia coli (E. coli), which also appear among New Hampshire's most-filed impairment causes (led by Mercury - Fish Consumption Advisory). It also lists Non-Native Aquatic Plants; Chlorophyll-a; and Phosphorus, Total, outside that top-five list.
| Other large assessed lakes in New Hampshire | Assessed acres |
|---|---|
| Lake Winnipesaukee Not Supporting | 44,315 |
| Squam Lake Not Supporting | 6,774 |
| Lake Umbagog Not Supporting | 4,639 |
| Newfound Lake Not Supporting | 4,440 |
| Lake Winnisquam Not Supporting | 4,203 |
| Sunapee Lake Not Supporting | 4,115 |
Peers near Robinson Pond's size or cause load
Similar assessed acres
Nearest filed extents (128 acres here).
- Dan George Lake · 128 acres · FL
- Caroline · 128 acres · MN
- Lake Louise · 128 acres · FL
- Mary · 128 acres · MN
Similar cause load
Nearest listed-cause counts (8 here). Peers already in the acreage column are omitted.
- Assabet River Reservoir · 8 causes · MA
- Billington Sea · 8 causes · MA
- Brownlee Reservoir, Upper (Weiser to Porters Flat) · 8 causes · ID
- Calumet · 8 causes · IL
What to do with this record
- The fish-consumption use is assessed as not supporting. Before eating fish from this reservoir, check your state fish-advisory program for species-specific meal limits. Consumption status guide
- Impairment listings follow the Clean Water Act 303(d) process; a listing is a regulatory finding, not a closure notice. 303(d) explained
PlainLakes renders state assessment decisions and federal gauge observations without modification. It does not issue advisories.
Assessment decisions on this page are rendered directly from state Integrated Report records in EPA's ATTAINS system; gauge figures are daily-value observations from the USGS National Water Information System, no number is typed in by an editor. Overall status, use verdicts, and causes are the state's reported decisions for assessment unit NHLAK700061203-06-01. Counts and percentiles are computed across all lake-type records PlainLakes ingests from ATTAINS. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-08-17. Primary sources: EPA ATTAINS and USGS National Water Information System.