San Mateo, NM
Contamination score
Higher = more contaminated vs. other cities.
Reported illness & cancer claims
No claims reported yet. Be the first to add one.
Claims are aggregated from public records and community reports and may be unverified. If you believe your illness is linked to local water, request a consultation.
Self-reported issues
No issues reported yet. Be the first to report one.

Public water systems
San Mateo Mdwca
- PWSID:
- NM3525733
- Source:
- Ground water
- Serves:
- 182 people
EPA & DEP violations
Lead and Copper Rule — MR violation
medium severityUnaddressedLead and Copper Rule MR violation (Unaddressed).
EPA SDWIS · MR · Began Oct 1, 2025 · 8 months ago · Source ↗
Consumer Confidence Rule — Other violation
medium severityResolvedConsumer Confidence Rule Other violation (Resolved).
EPA SDWIS · Other · Began Jul 1, 2025 · 11 months ago · Source ↗
Consumer Confidence Rule — Other violation
medium severityResolvedConsumer Confidence Rule Other violation (Resolved).
EPA SDWIS · Other · Began Oct 1, 2024 · 1 year ago · Source ↗
Consumer Confidence Rule — Other violation
medium severityResolvedConsumer Confidence Rule Other violation (Resolved).
EPA SDWIS · Other · Began Jul 1, 2024 · 1 year ago · Source ↗
E. COLI — MR violation
medium severityResolvedE. COLI MR violation (Resolved).
EPA SDWIS · MR · Began Nov 24, 2023 · 2 years ago · Source ↗
Groundwater Rule — TT violation
high severityHealth-basedResolvedGroundwater Rule TT violation (Resolved).
EPA SDWIS · TT · Began Jun 15, 2023 · 3 years ago · Source ↗
Consumer Confidence Rule — Other violation
medium severityResolvedConsumer Confidence Rule Other violation (Resolved).
EPA SDWIS · Other · Began Oct 1, 2021 · 4 years ago · Source ↗
Lead and Copper Rule — MR violation
medium severityResolvedLead and Copper Rule MR violation (Resolved).
EPA SDWIS · MR · Began Oct 1, 2021 · 4 years ago · Source ↗
Public Notice — Other violation
medium severityResolvedPublic Notice Other violation (Resolved).
EPA SDWIS · Other · Began Dec 20, 2019 · 6 years ago · Source ↗
Consumer Confidence Rule — Other violation
medium severityResolvedConsumer Confidence Rule Other violation (Resolved).
EPA SDWIS · Other · Began Oct 1, 2018 · 7 years ago · Source ↗
Groundwater Rule — TT violation
high severityHealth-basedResolvedGroundwater Rule TT violation (Resolved).
EPA SDWIS · TT · Began Sep 21, 2018 · 7 years ago · Source ↗
Groundwater Rule — TT violation
high severityHealth-basedResolvedGroundwater Rule TT violation (Resolved).
EPA SDWIS · TT · Began Sep 21, 2018 · 7 years ago · Source ↗
Consumer Confidence Rule — Other violation
medium severityResolvedConsumer Confidence Rule Other violation (Resolved).
EPA SDWIS · Other · Began Oct 1, 2017 · 8 years ago · Source ↗
Public Notice — Other violation
medium severityResolvedPublic Notice Other violation (Resolved).
EPA SDWIS · Other · Began Jun 18, 2017 · 8 years ago · Source ↗
Revised Total Coliform Rule — Other violation
medium severityResolvedRevised Total Coliform Rule Other violation (Resolved).
EPA SDWIS · Other · Began Jun 2, 2016 · 10 years ago · Source ↗
Groundwater Rule — TT violation
high severityHealth-basedUnaddressedGroundwater Rule TT violation (Unaddressed).
EPA SDWIS · TT · Began Apr 25, 2016 · 10 years ago · Source ↗
Coliform (TCR) — MCL violation
high severityHealth-basedResolvedColiform (TCR) MCL violation (Resolved).
EPA SDWIS · MCL · Began Sep 1, 2015 · 10 years ago · Source ↗
Violation — Violation violation
medium severityContaminant Violation violation.
EPA SDWIS · Violation · Began — · Source ↗
Water-related lawsuits
No lawsuits on record.
In the news & sources
No coverage linked yet.