Kansas lake · state assessment record
Lake Warnock (Atchison City Lake)
Assessment decisions reported by Kansas to EPA under Clean Water Act sections 303(d) and 305(b), last assessed in the 2024 reporting cycle.
- 33
- Assessed acres
- Lake
- Water type
This waterbody in one line
Lake Warnock (Atchison City Lake), a lake in Kansas, is assessed as not supporting one or more designated uses, with 4 listed impairment causes in the state's most recent Integrated Report cycle (2024). By assessed acreage it sits below the national median by assessed acreage (38,628 lakes); its impairment list is among the longest nationally (4 listed causes vs 23,610 assessed lakes). Aquatic life is assessed as not supporting.
- Not Supporting
- overall status
- P45
- Assessed size nationally
- P3
- 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.
How Lake Warnock (Atchison City Lake) reads against the filed register
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 Kansas, cause-list rank is the local separator: Lake Warnock (Atchison City Lake) is 11 of 304 indexed units by listed-cause count, toward the top of that state's filed lists.
Longer than most cause lists
4 listed causes puts this unit above 95% 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, 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.
Lake Warnock (Atchison City Lake): Category 5, TMDL still owed
Category 5 is the Integrated Report band where a TMDL (or equivalent) is still expected for Lake Warnock (Atchison City Lake). 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 Lake Warnock (Atchison City Lake) is Not Supporting. That tile summarizes the assessment unit; the designated-use rows and cause list are the evidence behind it.
According to the U.S. Environmental Protection Agency's ATTAINS program, Kansas carries 328 filed lake-type waterbodies in the August 2026 extract, and this page renders the assessment record EPA assigned to Lake Warnock (Atchison City Lake) 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 |
|---|---|---|
| Agricultural Supply Use--Irrigation | Other | Fully Supporting |
| Aquatic Life Use | Aquatic-life or related | Not Supporting |
| Domestic Water Supply | Drinking-water supply designation | Not Supporting |
| Primary Contact Recreation | Recreation | Not Supporting |
The record
Listed impairment causes
Causes the state listed as impairing designated uses of this lake, with the cycle each was first listed and the Clean Water Act action recorded against it.
| Cause | Affected uses | First listed | Cleanup standing |
|---|---|---|---|
| Eutrophication | Aquatic Life Use, Primary Contact Recreation, Domestic Water Supply | 2004 | TMDL priority: Medium |
| Arsenic | Domestic Water Supply | 2022 | TMDL priority: Low |
| Atrazine | Domestic Water Supply, Aquatic Life Use | 2022 | TMDL priority: Low |
| pH | Aquatic Life Use | 2024 | TMDL priority: Low |
Reading the record
Where Lake Warnock (Atchison City Lake) sits among peers
80% of Kansas's lakes assessed this deeply also came out mixed
Kansas ruled definitively on 4 designated uses at Lake Warnock (Atchison City Lake) and found 3 of 4 not supported. The dataset shows 277 Kansas lakes judged to that same depth.
Kansas's assessed lakes are most often judged on 4 uses, as this one was.
Computed share from EPA ATTAINS filed records, not an official EPA rating or safety grade.
| 1 | 2 | 3 | 4 | 5+ | |
|---|---|---|---|---|---|
| All supported | 7 | 8 | 15 | 53 | 0 |
| Mixed | Not possible | 3 | 1 | 222 (this record) | 1 |
| None supported | 1 | 0 | 5 | 2 | 0 |
Ringed cell: Lake Warnock (Atchison City Lake). Source: EPA ATTAINS, Reporting cycles 1987–2026.
Scale and rank
Lake Warnock (Atchison City Lake) is one of 328 lake-type waterbodies reported to EPA from Kansas, and one of 304 whose reported record carries enough populated assessment or gauge data for this site to list and index it. At 33 assessed acres it ranks 21,405th 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 21,404 lakes with a larger one.
Not yet on record
The state has not yet filed a definitive fish-consumption verdict for this record; that field populates when it reports it in a future Integrated Report cycle.
In context
Where Lake Warnock (Atchison City Lake) 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
33 Top 55% larger than 45% 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
4 Longer than most more listed causes than 95% 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 Lake Warnock (Atchison City Lake). Hover or tap any bar for its full count and share.
In context
Kansas context
ATTAINS carries 328 lake-type waterbodies in Kansas, 241 assessed as not supporting at least one use and 77 fully supporting. Among the 304 indexed units there, Lake Warnock (Atchison City Lake) ranks 11th by listed-cause count (4 listed causes) and 158th by assessed size among the 304 with an area filed; it sits in the not-supporting set (241 statewide) . Its listed causes include Eutrophication and pH, which also appear among Kansas's most-filed impairment causes (led by Eutrophication). It also lists Arsenic and Atrazine, outside that top-five list.
| Other large assessed lakes in Kansas | Assessed acres |
|---|---|
| Milford Lake Not Supporting | 16,000 |
| Tuttle Creek Lake Not Supporting | 15,380 |
| Waconda Lake Not Supporting | 12,602 |
| Perry Lake Not Supporting | 12,200 |
| Cheney Lake Not Supporting | 9,550 |
| John Redmond Lake Not Supporting | 9,400 |
Peers near Lake Warnock (Atchison City Lake)'s size or cause load
Similar assessed acres
Nearest filed extents (33 acres here).
- Bartlett Pond · 33 acres · MA
- Big Oak Tree S.P. Lake · 33 acres · MO
- Big Rock · 33 acres · IL
- Buck Creek Lake · 33 acres · NE
Similar cause load
Nearest listed-cause counts (4 here). Peers already in the acreage column are omitted.
- Agency Lake · 4 causes · OR
- Alachua Sink · 4 causes · FL
- Aldrich Pond · 4 causes · MA
- American Falls Reservoir (Snake River) · 4 causes · ID
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 KS-LM039801. 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.