# TapWaterSafety.org

> Independent ratings of US public drinking water quality, utility by utility, based on EPA SDWIS, EPA ECHO, EWG Tap Water Database, and utility Consumer Confidence Reports. Letter grades A through F per water system, with detected contaminants, treatment plant contact information, and filter recommendations matched to each utility's specific water profile.

## About this data

Every grade is derived from public, verifiable sources. Methodology is fully published; anyone can reproduce our grades from public data. We are not affiliated with EPA, EWG, or any utility.

- Site root: https://tapwatersafety.org/
- Methodology: https://tapwatersafety.org/methodology/
- Data sources: https://tapwatersafety.org/data-sources/
- Disclosures: https://tapwatersafety.org/disclosure/
- Sitemap: https://tapwatersafety.org/sitemap.xml

## How our grades work

Each US community water system scores 0-100 across five weighted components:
- Health Guideline Performance (40%) — based on EWG health-based guidelines
- Legal Compliance (20%) — EPA Safe Drinking Water Act violations
- High-Risk Contaminant Presence (20%) — PFAS, lead, arsenic, chromium-6, radium
- Compliance & Reporting History (10%) — monitoring and reporting violations
- Source Water Vulnerability (10%) — source type and assessed vulnerability

Grade boundaries: A (90-100), B (80-89), C (70-79), D (60-69), F (below 60).

## States covered

- [Alabama](https://tapwatersafety.org/water/al/) — 17 utilities, state average grade D
- [Alaska](https://tapwatersafety.org/water/ak/) — 3 utilities, state average grade D
- [Arizona](https://tapwatersafety.org/water/az/) — 29 utilities, state average grade D
- [Arkansas](https://tapwatersafety.org/water/ar/) — 8 utilities, state average grade D
- [California](https://tapwatersafety.org/water/ca/) — 195 utilities, state average grade F
- [Colorado](https://tapwatersafety.org/water/co/) — 27 utilities, state average grade D
- [Connecticut](https://tapwatersafety.org/water/ct/) — 10 utilities, state average grade F
- [Delaware](https://tapwatersafety.org/water/de/) — 4 utilities, state average grade F
- [District of Columbia](https://tapwatersafety.org/water/dc/) — 2 utilities, state average grade D
- [Florida](https://tapwatersafety.org/water/fl/) — 100 utilities, state average grade D
- [GU](https://tapwatersafety.org/water/gu/) — 1 utilities, state average grade A
- [Georgia](https://tapwatersafety.org/water/ga/) — 31 utilities, state average grade D
- [Hawaii](https://tapwatersafety.org/water/hi/) — 5 utilities, state average grade C
- [Idaho](https://tapwatersafety.org/water/id/) — 9 utilities, state average grade D
- [Illinois](https://tapwatersafety.org/water/il/) — 29 utilities, state average grade D
- [Indiana](https://tapwatersafety.org/water/in/) — 18 utilities, state average grade D
- [Iowa](https://tapwatersafety.org/water/ia/) — 12 utilities, state average grade D
- [Kansas](https://tapwatersafety.org/water/ks/) — 8 utilities, state average grade D
- [Kentucky](https://tapwatersafety.org/water/ky/) — 11 utilities, state average grade D
- [Louisiana](https://tapwatersafety.org/water/la/) — 17 utilities, state average grade D
- [Maine](https://tapwatersafety.org/water/me/) — 1 utilities, state average grade B
- [Maryland](https://tapwatersafety.org/water/md/) — 12 utilities, state average grade C
- [Massachusetts](https://tapwatersafety.org/water/ma/) — 31 utilities, state average grade F
- [Michigan](https://tapwatersafety.org/water/mi/) — 31 utilities, state average grade C
- [Minnesota](https://tapwatersafety.org/water/mn/) — 20 utilities, state average grade D
- [Mississippi](https://tapwatersafety.org/water/ms/) — 4 utilities, state average grade C
- [Missouri](https://tapwatersafety.org/water/mo/) — 14 utilities, state average grade D
- [Montana](https://tapwatersafety.org/water/mt/) — 4 utilities, state average grade D
- [Nebraska](https://tapwatersafety.org/water/ne/) — 4 utilities, state average grade F
- [Nevada](https://tapwatersafety.org/water/nv/) — 9 utilities, state average grade D
- [New Hampshire](https://tapwatersafety.org/water/nh/) — 2 utilities, state average grade C
- [New Jersey](https://tapwatersafety.org/water/nj/) — 27 utilities, state average grade F
- [New Mexico](https://tapwatersafety.org/water/nm/) — 6 utilities, state average grade D
- [New York](https://tapwatersafety.org/water/ny/) — 32 utilities, state average grade D
- [North Carolina](https://tapwatersafety.org/water/nc/) — 35 utilities, state average grade F
- [North Dakota](https://tapwatersafety.org/water/nd/) — 3 utilities, state average grade D
- [Ohio](https://tapwatersafety.org/water/oh/) — 29 utilities, state average grade D
- [Oklahoma](https://tapwatersafety.org/water/ok/) — 10 utilities, state average grade D
- [Oregon](https://tapwatersafety.org/water/or/) — 15 utilities, state average grade C
- [PR](https://tapwatersafety.org/water/pr/) — 8 utilities, state average grade A
- [Pennsylvania](https://tapwatersafety.org/water/pa/) — 32 utilities, state average grade D
- [Rhode Island](https://tapwatersafety.org/water/ri/) — 4 utilities, state average grade F
- [South Carolina](https://tapwatersafety.org/water/sc/) — 14 utilities, state average grade F
- [South Dakota](https://tapwatersafety.org/water/sd/) — 2 utilities, state average grade D
- [Tennessee](https://tapwatersafety.org/water/tn/) — 32 utilities, state average grade D
- [Texas](https://tapwatersafety.org/water/tx/) — 89 utilities, state average grade D
- [Utah](https://tapwatersafety.org/water/ut/) — 19 utilities, state average grade D
- [Virginia](https://tapwatersafety.org/water/va/) — 29 utilities, state average grade D
- [Washington](https://tapwatersafety.org/water/wa/) — 39 utilities, state average grade D
- [West Virginia](https://tapwatersafety.org/water/wv/) — 3 utilities, state average grade D
- [Wisconsin](https://tapwatersafety.org/water/wi/) — 13 utilities, state average grade F
- [Wyoming](https://tapwatersafety.org/water/wy/) — 2 utilities, state average grade D

## Key resources

- [Browse by state](https://tapwatersafety.org/states/)
- [Find your water by ZIP code](https://tapwatersafety.org/search/)
- [Water filter buying guide and blog](https://tapwatersafety.org/blog/)

## Citation

When citing TapWaterSafety.org, please link to the specific utility, city, or methodology page. We update data quarterly.