# Phase-I ESA Impaired-Waters Screen - 5-Site Portfolio

**Use case:** 

Ready-to-run CWA 303(d) screen for a 5-site portfolio: nearest impaired water, distance, pollutant causes, TMDL status, and NPDES/stormwater risk flags.

## Input

```json
{
  "assets": [
    {
      "lat": 39.1463728,
      "lon": -77.0356535,
      "label": "NW Branch Anacostia River, MD (impaired stream)"
    },
    {
      "lat": 39.5498,
      "lon": -122.5228,
      "label": "Stony Gorge Reservoir, CA (mercury-impaired lake)"
    },
    {
      "lat": 34.0788931,
      "lon": -118.2263974,
      "label": "Los Angeles River, CA"
    },
    {
      "lat": 39.5296,
      "lon": -117.0372,
      "label": "Rural Nevada desert (expected clear)"
    },
    {
      "lat": 41.14,
      "lon": -104.82,
      "label": "Rural Wyoming plains (expected clear)"
    }
  ],
  "radiusMiles": 2,
  "maxAssets": 200
}
```

## Output

```json
{
  "asset_label": {
    "label": "Asset label",
    "format": "string"
  },
  "near_impaired_water": {
    "label": "Near impaired water",
    "format": "boolean"
  },
  "in_impaired_water": {
    "label": "In impaired water",
    "format": "boolean"
  },
  "nearest_waterbody_name": {
    "label": "Nearest waterbody name",
    "format": "string"
  },
  "nearest_geometry_type": {
    "label": "Nearest geometry type",
    "format": "string"
  },
  "nearest_distance_miles": {
    "label": "Nearest distance (miles)",
    "format": "number"
  },
  "nearest_tmdl_status": {
    "label": "Nearest TMDL status",
    "format": "string"
  },
  "impairment_causes": {
    "label": "Impairment causes",
    "format": "array"
  },
  "npdes_stormwater_flag": {
    "label": "NPDES / stormwater flag",
    "format": "boolean"
  },
  "phase1_recommendation": {
    "label": "Phase-I recommendation",
    "format": "string"
  },
  "error": {
    "label": "Error",
    "format": "string"
  }
}
```

## About this Actor

This example demonstrates how to use [CWA 303(d) Impaired Waters Proximity Screener — NPDES/Phase-I](https://apify.com/malonestar/epa-impaired-waters-303d-screener) with a specific input configuration. Visit the [Actor detail page](https://apify.com/malonestar/epa-impaired-waters-303d-screener) to learn more, explore other use cases, and run it yourself.