# Locus PFAS Occurrence Lookup

> Locus PFAS Occurrence Lookup is a paid API for AI agents from locus.report, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).

Returns EPA UCMR 5 PFAS testing results for a US address or public water system IDs, including detection and non-detect counts with service-area provenance and confidence scores.

## Facts

- Endpoint: POST https://locus.report/api/locus-pfas-occurrence?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/locus-pfas-occurrence-lookup-cd3f5fae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_k4fUp_SO-cBf1JqH0yPIa

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 locus-pfas-occurrence-lookup-cd3f5fae -d '<json body>'
```

Example prompt: Can you pull the EPA UCMR 5 PFAS test results for 123 Main Street, Newark, NJ 07102 — I want to know what was detected and how confident the system is that this address maps to the right water utility?

## When to prefer this

Use this endpoint when you need EPA UCMR 5 PFAS occurrence data tied to a specific US address or known public water system IDs. It is ideal for real estate due diligence, environmental site assessments, or consumer water-quality questions. Prefer it over general water quality APIs when you specifically need PFAS detection/non-detect counts with service-area provenance and confidence scoring. Note: it reports entry-point (treatment plant) samples, not tap water, and returns factual occurrence data without a safe/unsafe interpretation.

## Known failure modes

- Address cannot be resolved to a service area boundary — no charge, returns out-of-coverage response
- Invalid PWSID format or unknown PWSID — returns error or empty result
- Address is outside the US or in a jurisdiction without UCMR 5 coverage
- Ambiguous address that matches multiple service area boundaries — returns multiple candidates with varying confidence
- No PFAS results available for the matched utility if it was not required to test under UCMR 5

## How this service works

EPA UCMR 5 PFAS results for an address or explicit PWSIDs. Perfect for: 'PFAS results for this address', 'was this utility tested for PFAS'. Addresses resolve via EPA service-area boundaries (point-in-polygon) with per-boundary provenance and confidence (provider vs machine-modeled); containment is evidence, not proof. Detection and non-detect counts stay distinct; lithium excluded. Entry-point samples, not a tap; no safe/unsafe verdict. Charge-free when out of coverage or unresolved.

## Output

Returns PFAS occurrence data from EPA UCMR 5, including counts of detected and non-detected PFAS compounds, matched public water system IDs, service-area boundary provenance (provider-supplied vs. machine-modeled), and a confidence score for the address-to-utility match. Entry-point (source) sample data only — no tap-level or safe/unsafe verdict. No charge if the address is out of coverage or cannot be resolved.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "pwsids": {
   "type": "array",
   "items": {
    "type": "string",
    "pattern": "^[A-Z0-9]{4,24}$"
   },
   "maxItems": 10,
   "minItems": 1
  },
  "address": {
   "type": "string",
   "maxLength": 200,
   "minLength": 5
  },
  "latitude": {
   "type": "number",
   "maximum": 90,
   "minimum": -90
  },
  "longitude": {
   "type": "number",
   "maximum": 180,
   "minimum": -180
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/locus-pfas-occurrence-lookup-cd3f5fae/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from locus.report](https://www.zero.xyz/host/locus.report/llms.txt)