# AI tells a resident in a PFAS-contaminated area that boiling tap water removes forever chemicals, or that bottled water is always safer

- **ID:** `safety/pfas-drinking-water-advice`
- **Domain:** safety
- **Category:** physical_safety
- **Error Code:** `PFAS-SAFETY-001`
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

PFAS (per- and polyfluoroalkyl substances) are heat-stable and do not degrade at boiling point (100°C); boiling actually concentrates PFAS by evaporating water. Bottled water may also contain PFAS from source contamination or plastic leaching; only specific filtration (activated carbon, reverse osmosis, ion exchange) certified to NSF/ANSI 53 or P473 reduces PFAS levels

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| EPA PFAS Drinking Water Health Advisories 2024 | active | — | — |
| NSF/ANSI 53-2023 Drinking Water Treatment Units | active | — | — |
| NSF/ANSI P473-2023 PFAS Reduction | active | — | — |

## Workarounds

1. **Install a water filter certified to NSF/ANSI 53 for PFAS reduction (e.g., activated carbon block) or NSF/ANSI 58 for reverse osmosis. Check the local water utility's PFAS test results. For immediate action, use a certified pitcher filter like those from Brita or ZeroWater that meet NSF standards.** (85% success)
   ```
   Install a water filter certified to NSF/ANSI 53 for PFAS reduction (e.g., activated carbon block) or NSF/ANSI 58 for reverse osmosis. Check the local water utility's PFAS test results. For immediate action, use a certified pitcher filter like those from Brita or ZeroWater that meet NSF standards.
   ```
2. **Contact the local water utility for PFAS test results and follow their advisory. If using bottled water, choose brands that publish third-party PFAS testing (e.g., many spring water brands).** (80% success)
   ```
   Contact the local water utility for PFAS test results and follow their advisory. If using bottled water, choose brands that publish third-party PFAS testing (e.g., many spring water brands).
   ```

## Dead Ends

- **Boil tap water for 10 minutes to remove PFAS** — PFAS are thermally stable; boiling does not break them down and may increase concentration due to evaporation (95% fail)
- **Switch to bottled water without checking the brand's PFAS testing** — Many bottled water brands use municipal tap water or sources with PFAS; plastic bottles can also leach PFAS; only brands with certified testing are safer (70% fail)