PlainWater

Sierra County, New Mexico

SDWIS compliance plate

Sheet NM051 · Sierra County 22 sys · 1,962 viol · #2235/3254

VIOL-SEVERE · HEALTH-LOW · RANK-LOWER · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-SMALL · BOOK-FULL

  • VIOL-SEVERE 95.5% flagged
  • HEALTH-LOW 18.7% health
  • RANK-LOWER #2235/3254
  • PHOTO-FINISH ±0.3 pp
  • PFAS-HIGH 50.0% detect
  • SRC-GW GW lead 100%
  • SYS-SMALL 22 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Bernalillo County ( -0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Sierra County ranks #2,235 of 3,254 counties by people served, and #24 of 33 counties in New Mexico. See methodology · corpus placement.

Sierra County standing, mid-flagged corpus third

Flagged-system rate 95.5% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 18.7% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 50.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #2,235 of 3,254 · #24 of 33 in New Mexico.

Flagged-rate neighbourhood around Sierra County

Lowest/highest poles plus in-state counties nearest Sierra County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Colfax · lowest Sierra · this county Sandoval · near Harding · highest 63.5% 95.1% 95.5% 98.1% 98.4% 98.4% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

Compare beyond New Mexico

Mid-flagged peers for Sierra County

Cross-state counties nearest Sierra County on flagged-system share (95.5%) and cumulative violation count (1,962). 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.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers
Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

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.