County profile · EPA SDWIS + UCMR5
Johnson County, Kansas
9 SDWIS-listed public water systems serve 668,443 people in Johnson County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.
- 9
- SDWIS water systems Smaller third of counties
- 321
- Total violations Lower third of counties
- 100.0%
- SDWIS systems w/ a violation Middle third of counties
- 83.3%
- UCMR5 PFAS rate (6 tested) Upper third of counties with tests
SDWIS compliance plate
Sheet KS091 · Johnson County 9 sys · 321 viol · #104/3254
VIOL-SEVERE · HEALTH-MID · RANK-TOP · PHOTO-FINISH · PFAS-HIGH · SRC-SW · SYS-TINY · BOOK-FULL
- VIOL-SEVERE 100.0% flagged
- HEALTH-MID 25.5% health
- RANK-TOP #104/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-HIGH 83.3% detect
- SRC-SW SW lead 78%
- SYS-TINY 9 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Wyandotte County (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Johnson County ranks #104 of 3,254 counties by people served, and #1 of 105 counties in Kansas. See methodology · corpus placement.
Johnson County standing, mid-flagged corpus third
Flagged-system rate 100.0% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 25.5% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 83.3% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #104 of 3,254 · #1 of 105 in Kansas.
Flagged-rate neighbourhood around Johnson County
Lowest/highest poles plus in-state counties nearest Johnson County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
| System Name | Population | Violations | PFAS |
|---|---|---|---|
| Water District 1 of Johnson Co | 482,000 | 5 | Detected |
| Olathe, City Of | 143,014 | 58 | Clean |
| Gardner, City Of | 23,942 | 70 | Detected |
| Johnson Co RWD 7 | 6,457 | 23 | Detected |
| Spring Hill, City Of | 5,694 | 20 | Detected |
| Desoto, City Of | 4,645 | 52 | Detected |
| Edgerton, City Of | 1,741 | 21 | - |
| New Century Air Center | 500 | 14 | - |
| Clearview City, City Of | 450 | 58 | - |
Compare beyond Kansas
Mid-flagged peers for Johnson County
Cross-state counties nearest Johnson County on flagged-system share (100.0%) and cumulative violation count (321). In-state neighbours stay on the compliance plate above.
Similar flagged-system rate
Nearest cross-state counties by % of SDWIS systems with at least one violation on record.
Similar violation load
Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).
Read our methodology · Check your water system - how this data is sourced, computed, and verified.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.