St. Mary Parish, Louisiana
SDWIS compliance plate
Sheet LA101 · St. Mary Parish 16 sys · 1,325 viol · #806/3254
VIOL-SEVERE · HEALTH-HIGH · RANK-UPPER · PHOTO-FINISH · PFAS-HIGH · SRC-SW · SYS-SMALL · BOOK-FULL
- VIOL-SEVERE 100.0% flagged
- HEALTH-HIGH 57.4% health
- RANK-UPPER #806/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-HIGH 85.7% detect
- SRC-SW SW lead 56%
- SYS-SMALL 16 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Jefferson Parish (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, St. Mary Parish ranks #806 of 3,254 counties by people served, and #20 of 64 counties in Louisiana. See methodology · corpus placement.
St. Mary Parish 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 57.4% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 85.7% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #806 of 3,254 · #20 of 64 in Louisiana.
Flagged-rate neighbourhood around St. Mary Parish
Lowest/highest poles plus in-state counties nearest St. Mary Parish on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
| System Name | Population | Violations | PFAS |
|---|---|---|---|
| Morgan City Water System | 12,703 | 52 | Clean |
| Water & Sewer Commission 4 of St Mary | 9,709 | 53 | Detected |
| Patterson Water System | 8,456 | 55 | Detected |
| Franklin Water Supply | 8,325 | 558 | Detected |
| St Mary Water & Sewer Comm #3 | 7,500 | 37 | Detected |
| Town of Berwick | 5,898 | 14 | Detected |
| St Mary Parish W&S #2 Bayou Vista | 5,379 | 2 | Detected |
| St Mary Parish Water Sewerage Comm 1 | 2,823 | 47 | - |
| St Mary Par Jt Water Sewer Commission 5 | 1,240 | 40 | - |
| Cypremort Point State Park | 500 | 20 | - |
| Port of West St Mary | 400 | 183 | - |
| Quintana Marina | 280 | 28 | - |
| Glencoe Community Water System | 190 | 140 | - |
| Compass Minerals La | 156 | 12 | - |
| Bayview Development | 100 | 28 | - |
| Berwick Bayou Vista Ww Commission | 0 | 56 | - |
Compare beyond Louisiana
Mid-flagged peers for St. Mary Parish
Cross-state counties nearest St. Mary Parish on flagged-system share (100.0%) and cumulative violation count (1,325). 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. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.