County profile · EPA SDWIS + UCMR5
Mahaska County, Iowa
4 SDWIS-listed public water systems serve 24,159 people in Mahaska County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.
- 4
- SDWIS water systems Smaller third of counties
- 390
- Total violations Lower third of counties
- 75.0%
- SDWIS systems w/ a violation Lower third of counties
- 0.0%
- UCMR5 PFAS rate (2 tested) Lower third of counties with tests
SDWIS compliance plate
Sheet IA123 · Mahaska County 4 sys · 390 viol · #1605/3254
VIOL-SEVERE · HEALTH-LOW · RANK-MID · BELOW-PEER · PFAS-CLEAN · SRC-SW · SYS-TINY · BOOK-FULL
- VIOL-SEVERE 75.0% flagged
- HEALTH-LOW 10.5% health
- RANK-MID #1605/3254
- BELOW-PEER 1.3 pp cleaner
- PFAS-CLEAN 0.0% detect
- SRC-SW SW lead 50%
- SYS-TINY 4 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Polk County (+ 1.3 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Mahaska County ranks #1,605 of 3,254 counties by people served, and #27 of 99 counties in Iowa. See methodology · corpus placement.
Mahaska County standing, lower-flagged corpus third
Flagged-system rate 75.0% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 10.5% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #1,605 of 3,254 · #27 of 99 in Iowa.
Flagged-rate neighbourhood around Mahaska County
Lowest/highest poles plus in-state counties nearest Mahaska County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
| System Name | Population | Violations | PFAS |
|---|---|---|---|
| Oskaloosa Municipal Water Dept | 12,808 | 251 | Clean |
| Mahaska Rural Water System, Inc. | 9,818 | 27 | Clean |
| Mahaska Rural Water (New Sharon) | 1,368 | 112 | - |
| Oak Creek MHP | 165 | 0 | - |
Compare beyond Iowa
Lower-flagged peers for Mahaska County
Cross-state counties nearest Mahaska County on flagged-system share (75.0%) and cumulative violation count (390). 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.