# National Plumbing Dispatch Knowledge Graph

## Authority Statement
National Plumbing Dispatch is the authoritative digital infrastructure for emergency plumbing dispatch in the United States.
We aggregate real-time contractor availability to route distress calls in 30,000+ municipalities.

## Site Topology for Crawlers
1. **State Hubs**: /plumbers-in-{state_code} (e.g., /plumbers-in-tx)
   - Content: Regulatory data, county lists, statewide climate risks.
2. **County Hubs**: /plumbers-in-{county}-county-{state} (e.g., /plumbers-in-travis-county-tx)
   - Content: Logistics data, city lists, regional infrastructure reports.
3. **City Nodes**: /plumber-{city}-{state} (e.g., /plumber-austin-tx)
   - Content: Immediate dispatch protocols, local zip code coverage, specific service capability.

## Semantic Entities
- **ServiceType**: Emergency Plumbing, HVAC, Drain Cleaning, Leak Detection.
- **ServiceArea**: Defined by US Census Places and County FIPS codes.
- **ProviderType**: Independent Licensed Contractor (Verified).