Active hazard footprint
0 active alerts
No NWS-driven alerts active in the cached water-summary feed. Drought + precipitation context land once those snapshots are committed.
No sewer overflow rows in the 30-day window.
County workspace
Williamson County
williamson-county
Williamson County water profile
County-level water context pulled from the Atlas Texas summary service. Use this as operating context, not a regulatory determination.
0
Active alerts
0
Stream gauges
0
Sewer overflows (30d)
0
General permits
Investigation context
Weather + hydrology context for Williamson County
Composite operating context — active hazards, hydrologic features, surface-water condition, and infrastructure footprint — pulled from cached snapshots only.
Hydrology features
8 TWDB features
GULF_COAST · CARRIZO · Brazos · Colorado
6 Major Aquifers · 4 Major River Basins · 3 HUC 8 Hydrologic Units
Surface water condition
4 impaired / 14 segments
29% of cached TCEQ surface segments in this county carry at least one impairment flag.
Basin: Brazos River Basin
Drinking-water exposure
17 SDWIS violations
4 public water systems with cached health-based violations since 2023-04-01. 6,579 people served by those systems.
Top PWS: CITY OF FLORENCE (6 viol.) · Top contaminant code: 2950
Stream gauge coverage
0 active gauges
No active stream gauges in the cached water-summary feed. Hydrologic stress signal lands once gauges fold in.
USGS streamflow anomaly + drought class join in next-up.
Boil-water proxy · microbial rule
No microbial violations cached
No SDWIS rule-group 100 microbial violations cached for this county. Tier-1 boil-water-equivalent events activate this lane when they post.
Treatment stress · E2 disinfectant
11 disinfectant violations
2 PWSes carry SDWIS rule-group 200 (Disinfectants and Disinfection Byproducts Rule) violations — the same rule family that drives E2 disinfectant residual reporting.
Top PWS: CITY OF THRALL (6 viol.) · Top contaminant code: 2950 · Latest: 2025-10-01
Impaired surface segments in this county
- Mankins BranchBrazos River Basin · contact recreation
- South Fork San Gabriel RiverBrazos River Basin · general use
- San Gabriel/North Fork San Gabriel RiverBrazos River Basin · general use
- Willis CreekBrazos River Basin · contact recreation
Impairment is a legal-use-support classification, not a direct harm claim.
Mismatch signals
Score: 34
- • surface-water impairment is present with no active hazard alerts in the cached feed
- • 4 impaired segments without any cached active permit pressure — enforcement gap candidate
Active alerts
No active alerts.
Stream gauges
No gauges loaded.
Notes
- • Nearby surface-water impairment context is additive only; it is not a standalone verdict on county-wide harm.
- • NFHL political jurisdictions mapped: 152
- • Surface-water segments: 14 (4 impaired)