Data updated March 2026 — 15,744+ cities graded across all 50 states
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Live data from 15,744 water systems

What's in your water?

Instant EPA-based quality grades for every city and ZIP code in America
EPA Data Updated Quarterly 100% Free
B+
Naperville, IL
Score: 81.2/100
F
Los Angeles, CA
Score: 42.8/100
F
Houston, TX
Score: 27.8/100
15,744 cities graded
52 states covered
176M Americans on PFAS-affected water
2,854 PFAS detections
Q1 2026 data
15,744 cities graded
52 states covered
176M Americans on PFAS-affected water
2,854 PFAS detections
Q1 2026 data

Most searched cities

All cities →

Worst water in America

Full rankings →
Dayton
Ohio
F
Score: 19.8/100
Violations PFAS Lead Unresolved
Dallas
Pennsylvania
F
Score: 22.2/100
Violations PFAS Lead Unresolved
Georgetown
Delaware
F
Score: 24/100
Violations PFAS Unresolved
Lititz
Pennsylvania
F
Score: 24.2/100
Violations Lead Unresolved
Honey Brook
Pennsylvania
F
Score: 25/100
Violations Lead Unresolved
Chenango (T)
New York
F
Score: 25.2/100
Violations PFAS Lead Unresolved

Best water in America

Full rankings →
Haina
Hawaii
A+
Score: 100/100
Zero violations Low PFAS No lead issues
Kilauea (Dow)
Hawaii
A+
Score: 100/100
Low PFAS No lead issues
Olaa-Mt.View
Hawaii
A+
Score: 100/100
Zero violations Low PFAS No lead issues
Richland (T)
New York
A+
Score: 100/100
Zero violations Low PFAS No lead issues
Buhl
Alabama
A+
Score: 99.9/100
Low PFAS No lead issues
Fenwick Island
Maryland
A+
Score: 99.9/100
Low PFAS No lead issues

PFAS Contamination Tracker

Full PFAS report →
60%
of US tap water contains detectable PFAS "forever chemicals"
2,854
Water systems with PFAS detections
176M
Americans potentially exposed
4 ppt
New EPA limit for PFOS (2024)
9,728
Known contamination sites nationwide
PFAS contamination map of US states Alabama: Grade B+ (Score 83) — 353 cities Alaska: Grade C- (Score 55) — 79 cities Arizona: Grade C+ (Score 68) — 292 cities Colorado: Grade C+ (Score 66) — 246 cities Florida: Grade C+ (Score 69) — 388 cities Georgia: Grade B- (Score 73) — 378 cities Indiana: Grade B (Score 78) — 414 cities Kansas: Grade B (Score 76) — 323 cities Maine: Grade B+ (Score 80) — 168 cities Massachusetts: Grade B (Score 79) — 280 cities Minnesota: Grade A- (Score 88) — 466 cities New Jersey: Grade B- (Score 70) — 435 cities North Carolina: Grade C+ (Score 69) — 417 cities North Dakota: Grade A- (Score 85) — 103 cities Oklahoma: Grade C (Score 61) — 358 cities Pennsylvania: Grade C- (Score 58) — 560 cities South Dakota: Grade B+ (Score 81) — 141 cities Texas: Grade C+ (Score 68) — 1067 cities Wyoming: Grade C+ (Score 70) — 65 cities Connecticut: Grade C- (Score 59) — 158 cities Missouri: Grade B (Score 79) — 509 cities West Virginia: Grade C (Score 61) — 248 cities Illinois: Grade B (Score 80) — 891 cities New Mexico: Grade C- (Score 58) — 163 cities Arkansas: Grade B (Score 80) — 345 cities California: Grade B (Score 77) — 694 cities Delaware: Grade B (Score 77) — 43 cities District of Columbia: Grade B (Score 77) — 6 cities Hawaii: Grade A (Score 92) — 66 cities Iowa: Grade A- (Score 88) — 436 cities Kentucky: Grade B (Score 79) — 246 cities Maryland: Grade B- (Score 74) — 107 cities Michigan: Grade B+ (Score 81) — 520 cities Mississippi: Grade C+ (Score 69) — 320 cities Montana: Grade C+ (Score 66) — 115 cities New Hampshire: Grade C (Score 62) — 119 cities New York: Grade B+ (Score 81) — 855 cities Ohio: Grade B (Score 77) — 511 cities Oregon: Grade C (Score 62) — 213 cities Tennessee: Grade B+ (Score 83) — 299 cities Utah: Grade B- (Score 70) — 177 cities Virginia: Grade B (Score 79) — 230 cities Washington: Grade B- (Score 70) — 294 cities Wisconsin: Grade B (Score 78) — 446 cities Nebraska: Grade A- (Score 86) — 200 cities South Carolina: Grade B+ (Score 82) — 196 cities Idaho: Grade C+ (Score 68) — 139 cities Nevada: Grade B (Score 75) — 66 cities Vermont: Grade B- (Score 74) — 105 cities Louisiana: Grade C+ (Score 66) — 309 cities Rhode Island: Grade C+ (Score 69) — 35 cities AL AK AZ CO FL GA IN KS ME MA MN NJ NC ND OK PA SD TX WY CT MO WV IL NM AR CA DE DC HI IA KY MD MI MS MT NH NY OH OR TN UT VA WA WI NE SC ID NV VT LA RI
PFAS Contamination
Low risk
Moderate
Elevated
High risk
Click any state for full report
Read the PFAS deep-dive →

Explore contamination maps

All maps →

Interactive state-by-state maps for every major contaminant we track. See where your state ranks.

🚰
Lead Levels
371 cities above action level
✖
Violations
223,657 health-based violations
🧪
HAA5 Byproducts
23 cities above 60 µg/L MCL
⚗
Chromium-6
3,927 cities with detections

How we calculate your water score

Score weight distribution
40%
25%
25%
10%
Violations 40%
Lead & Copper 25%
PFAS Levels 25%
Compliance 10%
⚠
Violations
40% weight
Health-based MCL violations, treatment technique failures, and monitoring violations from EPA SDWIS data.
🚰
Lead & Copper
25% weight
90th percentile lead and copper levels from the Lead and Copper Rule. Includes pipe material and replacement progress.
💧
PFAS Levels
25% weight
PFOA, PFOS, and total PFAS concentrations from UCMR 5 monitoring data against new 2024 MCLs.
✓
Compliance
10% weight
Timely reporting, consumer notification, and public water system operator certification status.

How does your state rank?

View all 52 states →
Water quality grades map of US states Alabama: Grade B+ (Score 83) — 353 cities Alaska: Grade C- (Score 55) — 79 cities Arizona: Grade C+ (Score 68) — 292 cities Colorado: Grade C+ (Score 66) — 246 cities Florida: Grade C+ (Score 69) — 388 cities Georgia: Grade B- (Score 73) — 378 cities Indiana: Grade B (Score 78) — 414 cities Kansas: Grade B (Score 76) — 323 cities Maine: Grade B+ (Score 80) — 168 cities Massachusetts: Grade B (Score 79) — 280 cities Minnesota: Grade A- (Score 88) — 466 cities New Jersey: Grade B- (Score 70) — 435 cities North Carolina: Grade C+ (Score 69) — 417 cities North Dakota: Grade A- (Score 85) — 103 cities Oklahoma: Grade C (Score 61) — 358 cities Pennsylvania: Grade C- (Score 58) — 560 cities South Dakota: Grade B+ (Score 81) — 141 cities Texas: Grade C+ (Score 68) — 1067 cities Wyoming: Grade C+ (Score 70) — 65 cities Connecticut: Grade C- (Score 59) — 158 cities Missouri: Grade B (Score 79) — 509 cities West Virginia: Grade C (Score 61) — 248 cities Illinois: Grade B (Score 80) — 891 cities New Mexico: Grade C- (Score 58) — 163 cities Arkansas: Grade B (Score 80) — 345 cities California: Grade B (Score 77) — 694 cities Delaware: Grade B (Score 77) — 43 cities District of Columbia: Grade B (Score 77) — 6 cities Hawaii: Grade A (Score 92) — 66 cities Iowa: Grade A- (Score 88) — 436 cities Kentucky: Grade B (Score 79) — 246 cities Maryland: Grade B- (Score 74) — 107 cities Michigan: Grade B+ (Score 81) — 520 cities Mississippi: Grade C+ (Score 69) — 320 cities Montana: Grade C+ (Score 66) — 115 cities New Hampshire: Grade C (Score 62) — 119 cities New York: Grade B+ (Score 81) — 855 cities Ohio: Grade B (Score 77) — 511 cities Oregon: Grade C (Score 62) — 213 cities Tennessee: Grade B+ (Score 83) — 299 cities Utah: Grade B- (Score 70) — 177 cities Virginia: Grade B (Score 79) — 230 cities Washington: Grade B- (Score 70) — 294 cities Wisconsin: Grade B (Score 78) — 446 cities Nebraska: Grade A- (Score 86) — 200 cities South Carolina: Grade B+ (Score 82) — 196 cities Idaho: Grade C+ (Score 68) — 139 cities Nevada: Grade B (Score 75) — 66 cities Vermont: Grade B- (Score 74) — 105 cities Louisiana: Grade C+ (Score 66) — 309 cities Rhode Island: Grade C+ (Score 69) — 35 cities AL AK AZ CO FL GA IN KS ME MA MN NJ NC ND OK PA SD TX WY CT MO WV IL NM AR CA DE DC HI IA KY MD MI MS MT NH NY OH OR TN UT VA WA WI NE SC ID NV VT LA RI
Water Quality Score
80-100 (A/B)
60-79 (C+/B-)
40-59 (D/C)
0-39 (F)
Click any state for full report
State Grade Score Score bar # Cities
Hawaii
A
 92
66
QC
A
 92
1
Iowa
A-
 88
436
Minnesota
A-
 88
466
Nebraska
A-
 86
200
Alaska
C-
 55
79
Pennsylvania
C-
 58
560
New Mexico
C-
 58
163
Connecticut
C-
 59
158
West Virginia
C
 61
248
View all 52 states →

State water quality rankings

Full rankings →
▲ Top 5 states
1 Hawaii
A
92 2 QC
A
92 3 Iowa
A-
88 4 Minnesota
A-
88 5 Nebraska
A-
86
▼ Bottom 5 states
48 Alaska
C-
55 49 Pennsylvania
C-
58 50 New Mexico
C-
58 51 Connecticut
C-
59 52 West Virginia
C
61

Active water alerts

All alerts →

Protect your water

Full filter guide →
💧
Pitcher Filters
$20 – $60
Best for: Lead, chlorine, taste
  • No installation required
  • Replace filter every 2-3 months
  • NSF 53 certified picks available
View top picks →
🚰
Under-Sink Systems
$120 – $400
Best for: PFAS, lead, bacteria
  • Reverse osmosis or multi-stage
  • Higher contaminant removal rates
  • 6-12 month filter life
Compare options →
🏠
Whole-House Filters
$500 – $2,000+
Best for: PFAS, lead, sediment, both taps
  • Filters every faucet and shower
  • Professional installation
  • Best for well water or high contamination
Testing guide →

Essential reading

All guides →

Expert guides to help you understand your water quality report, filter the right contaminants, and protect your household.

01
Guide 12 min read
Pregnant Women & Water Quality: What You Need to Know
Water safety during pregnancy: which contaminants cross the placenta, prenatal exposure risks, and the filters that protect maternal and fetal health.
02
Guide 11 min read
EPA's CCL 6 Explained: How the Drinking Water Watch List Becomes Regulation
EPA's draft CCL 6 added microplastics, pharmaceuticals, and PFAS to the watch list. Learn how the CCL pipeline works — from listing to MCL — and what's actually next.
03
Guide 12 min read
PFAS in Private Wells: The Regulatory Blind Spot Affecting 40 Million Americans
Private wells aren't covered by the EPA's PFAS rule. Twenty states don't test wells for PFAS unless contamination is already suspected. Here's what to do.
04
Guide 13 min read
Best Countertop Water Filters (2026)
Countertop and gravity filters for renters and small homes. Top 2026 picks with NSF certifications, prices, and honest trade-offs — no plumbing required.

Latest news

All news →
droughtarizona

Colorado River Heads Into Its Driest Year on Record as Arizona Cities Tighten Water Rules

Lake Mead and Lake Powell are near record lows, Arizona's CAP deliveries are cut, and Phoenix-area cities are on Stage 2 drought rules as 2026 talks stall.

Jun 1, 2026
droughttexas

Corpus Christi's Reservoirs Hit 8.5% as the City Plans Mandatory 25% Water Cuts

Corpus Christi's reservoirs sit near 8.5% full. The city has a plan to cut water use 25% — including its petrochemical giants — if an emergency hits.

Jun 1, 2026
pfasepa

EPA Moves to Rescind Four PFAS Drinking-Water Limits and Push the PFOA/PFOS Deadline to 2031

EPA's May 18 proposal would rescind limits on GenX, PFHxS, PFNA and the Hazard Index, and let utilities delay PFOA/PFOS compliance to 2031.

Jun 1, 2026
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