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
Calhoun County
calhoun-county
Calhoun 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 Calhoun County
Composite operating context — active hazards, hydrologic features, surface-water condition, and infrastructure footprint — pulled from cached snapshots only.
Hydrology features
4 TWDB features
GULF_COAST · CARRIZO · Lavaca-Guadalupe · Lower San Antonio
3 Major Aquifers · 1 Major River Basins · 1 HUC 8 Hydrologic Units
Surface water condition
5 impaired / 14 segments
36% of cached TCEQ surface segments in this county carry at least one impairment flag.
Basin: Bays and Estuaries, Lavaca River Basin+
Drinking-water exposure
128 SDWIS violations
11 public water systems with cached health-based violations since 2023-04-01. 19,275 people served by those systems.
Top PWS: CITY OF PORT LAVACA (36 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
1 microbial violations
1 PWS carry SDWIS rule-group 100 (microbial) violations — the same rule that triggers Texas boil-water advisories. 1 of those are Tier 1 (24-hour public notice).
Top PWS: GUADALUPE BLANCO RIVER AUTHORITY (1 viol.) · Latest: 2025-04-01
Treatment stress · E2 disinfectant
122 disinfectant violations
8 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 PORT LAVACA (36 viol.) · Top contaminant code: 2950 · Latest: 2025-10-01
Impaired surface segments in this county
- Cox BayBays and Estuaries · aquatic life
- Cox Bay (Oyster Waters)Bays and Estuaries · oyster waters
- San Antonio Bay/Hynes Bay/Guadalupe Bay/Mission Lake (Oyster Waters)Bays and Estuaries · oyster waters
- Lavaca Bay Ship Channel AreaBays and Estuaries · aquatic life, fish consumption
- Keller Bay (Oyster Waters)Bays and Estuaries · oyster waters
Impairment is a legal-use-support classification, not a direct harm claim.
Mismatch signals
Score: 56
- • surface-water impairment is present with no active hazard alerts in the cached feed
- • 5 impaired segments without any cached USGS stream gauges — under-monitored surface water
- • 5 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: 5
- • Surface-water segments: 14 (5 impaired)