# CDC NWSS Wastewater Surveillance by State

> CDC NWSS Wastewater Surveillance by State is a paid API for AI agents from api.healthtravel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Returns CDC National Wastewater Surveillance System (NWSS) sampling site data for a specified US state, including plant info, county, population served, 15-day detection proportion, percentile, and sample dates.

## Facts

- Endpoint: GET https://api.healthtravel-api.workers.dev/api/health/covid19-cdc-wastewater?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cdc-nwss-wastewater-surveillance-by-state-078b5c2f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GBKIGi55X06IOo6g7dlog

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability cdc-nwss-wastewater-surveillance-by-state-078b5c2f
```

Example prompt: Pull up the CDC wastewater surveillance data for Vermont — show me up to 20 monitoring sites with their counties, population served, 15-day detection proportions, and sample dates.

## When to prefer this

Use this endpoint when you need structured wastewater surveillance data from the CDC NWSS for a specific US state, including detection proportions, percentiles, and population coverage per site. Prefer this over general web search when you need machine-readable, structured CDC data without scraping. Not suitable for confirmed COVID-19 case counts or named-pathogen data.

## Known failure modes

- Invalid or misspelled state name returns an error or empty result
- State name not found in CDC dataset returns no sites
- Requesting more than 50 sites is capped or rejected
- Data may be stale if CDC upstream has not refreshed recently
- Network or upstream data.cdc.gov outage returns a service error

## How this service works

CDC National Wastewater Surveillance System (NWSS) sampling sites in one US state (data.cdc.gov): wastewater plant, county, population served, 15-day detection proportion, percentile and sample dates. The pathogen is not named in the dataset; this is not confirmed COVID-19 activity. Up to 50 sites per call.

## Output

A list of up to 50 wastewater sampling sites in the requested state, each including the plant name, county, population served, 15-day detection proportion, percentile ranking, and sample dates. The pathogen is not identified in the dataset; data reflects CDC NWSS surveillance metrics only.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "state"
     ],
     "properties": {
      "max": {
       "type": "string",
       "description": "How many sites, 1 to 50 (default 10)"
      },
      "state": {
       "type": "string",
       "description": "US state name as in the dataset, e.g. Vermont, 3 to 40 letters and spaces"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cdc-nwss-wastewater-surveillance-by-state-078b5c2f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.healthtravel-api.workers.dev](https://www.zero.xyz/host/api.healthtravel-api.workers.dev/llms.txt)