California reservoir · state assessment record
Tahoe Keys Sailing Lagoon
Assessment decisions reported by California to EPA under Clean Water Act sections 303(d) and 305(b), last assessed in the 2020 reporting cycle.
- 113
- Assessed acres
- Lake / Reservoir / Pond
- Water type
This waterbody in one line
Tahoe Keys Sailing Lagoon, a reservoir in California, is assessed as not supporting one or more designated uses, with one listed impairment cause in the state's most recent Integrated Report cycle (2020). By assessed acreage it sits above the national median by assessed acreage (38,628 lakes); its impairment list is among the longest nationally (one listed cause vs 23,610 assessed lakes). California rules it not supporting for warm freshwater habitat, while other aquatic-life uses are supported. California assesses commercial and sport fishing as supported; it reported no verdict on fish consumption itself.
- Not Supporting
- overall status
- P72
- Assessed size nationally
- P20
- Shorter cause list
- Not Supporting
- aquatic-life or related
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 Tahoe Keys Sailing Lagoon'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 California, cause-list rank 145 of 195 is mid-pack, the state peer table is not driven by an extreme list length here.
Not one verdict, several
This record splits: Not Supporting on aquatic life, Fully Supporting on fish consumption. The divergence is inside the designated-use matrix, not a single all-or-nothing label.
Tahoe Keys Sailing Lagoon: Category 5, TMDL still owed
Category 5 is the Integrated Report band where a TMDL (or equivalent) is still expected for Tahoe Keys Sailing Lagoon. Read the listed causes and any cleanup actions filed beside them before treating the overall status tile as a finished restoration story.
Overall status: not supporting
The filer's overall status for Tahoe Keys Sailing Lagoon is Not Supporting. That tile summarizes the assessment unit; the designated-use rows and cause list are the evidence behind it.
Large assessed unit
At 112.7 acres, Tahoe Keys Sailing Lagoon clears the upper tercile of assessed lake-type units with an area on file (10,819 still larger). Size comparisons use the portal's deduplicated lake ranking population, not raw ATTAINS row counts.
According to the U.S. Environmental Protection Agency's ATTAINS program, California carries 607 filed lake-type waterbodies in the August 2026 extract, and this page renders the assessment record EPA assigned to Tahoe Keys Sailing Lagoon 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.
| Designated use | Group | Verdict |
|---|---|---|
| Cold Freshwater Habitat | Aquatic-life or related | Fully Supporting |
| Commercial and Sport Fishing | Fish-consumption or fishery | Fully Supporting |
| Municipal and Domestic Supply | Drinking-water supply designation | Fully Supporting |
| Warm Freshwater Habitat | Aquatic-life or related | Not 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 |
|---|---|---|---|
| pH | Warm Freshwater Habitat | 2018 | None reported |
Probable sources
California listed the source of the impairment as unknown. That is the state's own filed value, not a gap in this record: the cause has been identified, the origin has not.
Reading the record
Where Tahoe Keys Sailing Lagoon sits among peers
8 of 15 California lakes assessed this deeply also came out mixed
California ruled definitively on 4 designated uses at Tahoe Keys Sailing Lagoon and found 1 of 4 not supported. The dataset shows 15 California lakes judged to that same depth.
California's assessed lakes are most often judged on 2 uses; this one was judged on 4.
| 1 | 2 | 3 | 4 | 5+ | |
|---|---|---|---|---|---|
| All supported | 11 | 8 | 0 | 0 | 3 |
| Mixed | Not possible | 3 | 10 | 8 (this record) | 8 |
| None supported | 46 | 107 | 11 | 7 | 2 |
Ringed cell: Tahoe Keys Sailing Lagoon. Source: EPA ATTAINS, Reporting cycles 1987–2026.
Scale and rank
Tahoe Keys Sailing Lagoon is one of 607 lake-type waterbodies reported to EPA from California, and one of 195 whose reported record carries enough populated assessment or gauge data for this site to list and index it. At 113 assessed acres it ranks 10,820th 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 10,819 lakes with a larger one.
Still unfiled
The state has not yet filed a definitive recreation verdict for this record; that field populates when it reports it in a future Integrated Report cycle.
In context
Where Tahoe Keys Sailing Lagoon 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
113 Top 28% larger than 72% 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
1 Longer than most more listed causes than 49% 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 Tahoe Keys Sailing Lagoon. Hover or tap any bar for its full count and share.
In context
California context
ATTAINS carries 607 lake-type waterbodies in California, 202 assessed as not supporting at least one use and 22 fully supporting. Among the 195 indexed units there, Tahoe Keys Sailing Lagoon ranks 145th by listed-cause count (one listed cause) and 124th by assessed size among the 195 with an area filed; it sits in the not-supporting set (202 statewide) . Its listed causes include pH, which also appears among California's most-filed impairment causes (led by Mercury).
| Other large assessed lakes in California | Assessed acres |
|---|---|
| Salton Sea Not Supporting | 233,045 |
| Tahoe, Lake Not Supporting | 84,092 |
| Goose Lake (Modoc County) Not reported | 62,385 |
| Honey Lake Not Supporting | 55,526 |
| Klamath River HU, Tule Lake and Lower Klamath Lake National Wildlife Refuge Not Supporting | 48,791 |
| Mono Lake Not Supporting | 45,299 |
Peers near Tahoe Keys Sailing Lagoon's size or cause load
Similar assessed acres
Nearest filed extents (113 acres here).
- Fish Lake · 113 acres · OR
- Cypress Lake · 113 acres · FL
- Bray · 113 acres · MN
- Loco Lake · 113 acres · OR
Similar cause load
Nearest listed-cause counts (1 here). Peers already in the acreage column are omitted.
- Aaron · 1 causes · MN
- Aaron River Reservoir · 1 causes · MA
- Abbotts Creek (including Lexington-Thomasville Water Supply Reservoir at normal reservoir elevation, Tom-A-Lex Lake) · 1 causes · NC
- Abeniki Lake · 1 causes · NH
What to do with this record
- Assessment verdicts are cycle-based, not real-time. For fish-consumption decisions, your state advisory program is the binding source. 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 CAL6341004220020726131244. 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.