The States That Hydrate Best (and Worst): A National Water Intake Ranking

Every state claims to do something better than the other 49. Barbecue, beaches, college football, passive aggression. Hydration somehow escaped the rankings treatment, so we fixed that. We scored all 50 states on a composite hydration index built from four metrics: how much plain water residents actually drink, how active they are, how hot it gets, and how clean the tap water is.

The headline: Alaska is the most hydrated state in America, with a perfect score of 100, and Arkansas finishes dead last with a score of 30. In between, the Mountain West runs the table, the country's biggest water drinkers can't crack the top 20, and one New England state gets sunk by its own pipes.

Key Takeaways

• Alaska is America's most hydrated state, followed by Colorado, Utah, Washington, and New Hampshire. They win on the balance of cool climates, active populations, and strong water drinking habits; no single state leads all four categories at once.

• California residents are projected to drink the most water in the country at 45.7 oz. per person per day, with New Mexico, Texas, Utah, and Colorado close behind.

• Colorado has the most active population in America, with only 16.8% of adults reporting no exercise outside of work. Utah, Washington, Oregon, and Montana round out a top 5. Activity earns its spot in the index because more active people tend to drink more plain water.

• Alaska has the coolest climate in the nation, with an average of 26.6°F, nearly 14°F colder than runner-up North Dakota. Maine, Minnesota, and Wyoming complete the top 5, and less heat means less fluid lost, the single biggest reason Alaska takes the overall crown.

• Hawaii has the cleanest tap water in America, with an average of zero health-based violations per system, ahead of Delaware (1), South Dakota (1.1), North Dakota (1.2), and Ohio (1.3).

The Most Hydrated States in America

The top of the ranking belongs to states where the weather does half the work and the residents handle the rest.

• Alaska takes the crown with a perfect score of 100, and it isn't because Alaskans are chugging. The state ranks 6th in water intake (44.7 oz. per day), and a mediocre 41st in tap water quality, but its 26.6°F average temperature means residents lose less fluid to heat than anyone else in the country.

• Colorado misses the top spot by 0.7 points. The state pairs the most active population in America (only 16.8% of adults report no exercise outside of work) with the 5th-highest water intake. Utah, one spot back at No. 3 overall, is the only other state to pull off that double.

• The Mountain West and Pacific Northwest own the leaderboard. Colorado, Utah, Washington, Oregon, and Montana all land in the top 10, with New Hampshire (No. 5) and Vermont (No. 8) keeping New England in the conversation.

• New England coasts more than it sips. New Hampshire cracked the top 5 while ranking just 28th in actual water intake, and Maine sits at 17th overall despite ranking 43rd for drinking. Cool weather covers for a lot of half-empty glasses.

• The quiet overachievers are Wisconsin (No. 9) and North Dakota (No. 10), which crack the top 10 on cold winters and some of the cleanest tap water in the country (8th and 4th best, respectively).

The Least Hydrated States Have a Clear Zip Code

The bottom of this ranking is not evenly distributed. It pools in one region.

• Arkansas finishes 50th with a total hydration score of 30, a full 70 points behind No. 1 Alaska. It isn't catastrophic at any one thing; it's just bad at everything. Arkansas and Louisiana (No. 49) are the only two states that rank in the bottom 10 on all four metrics.

• The South claims 8 of the bottom 10 spots: Arkansas, Louisiana, Mississippi, Oklahoma, Alabama, West Virginia, South Carolina, and Florida. The region's mix of heat and inactivity is hard to outdrink.

• Mississippi residents drink the least water (41.8 oz. per day) and report the most inactivity (31.9% of adults). The state's tap water is actually fine, ranking 16th cleanest, so this one is on habits, not infrastructure.

• Rhode Island is the only Northeastern state in the bottom 10, at No. 44. Its water intake is respectable (18th), but the worst tap water record in the nation (5.5 health-based violations per system) sinks the whole score.

• Florida is the hottest state, with an average annual temperature of 70.7°F, and it ranks 42nd overall. When the climate works against you all 12 months, average habits aren't enough.

No State Wins on Water Alone

The clearest lesson in the data is that hydration is a balance, not a single habit. Alaska took the title with unremarkable tap water. California out-drinks everyone and finishes mid-pack. The states at the top aren't doing anything heroic. They're just losing less, whether that's fluid to heat or ground to inactivity.

The states at the bottom face the opposite math. A hot climate, a sedentary population, and shaky pipes all raise the bar for what "enough water" means. You can't move the weather. The one variable every resident actually controls is the glass in front of them.

Methodology

For this ranking, each state gets scored on four things: estimated water intake, physical activity, heat, and tap-water quality. Overall, we scored each state on a scale from 0 to 100, with the healthiest state receiving a score of 100. Water intake counts for 15%; the other three split the remaining 85% evenly. Water gets the smallest share because it's the only metric we can't measure directly by state.

The four metrics:

1. Estimated water intake: No survey tracks how much water people actually drink state by state, so we modeled it. National NHANES plain-water rates by race, age, sex, and activity, applied to each state's population mix (2020 Census race, Census age data, BRFSS activity), scaled to the ~44 oz./day national average. We specifically looked at plain water, and not water consumption through food or other methods. Higher is better.

2. Physical inactivity: The share of adults who report no exercise outside work (BRFSS, 2022). More inactivity lowers the score, as regular activity raises the body's hydration needs and tends to keep water front of mind.

3. Heat: Average annual temperature (NOAA normals). Hotter states carry more dehydration risk.

4. Tap-water quality: Health-based drinking-water violations per water system (EPA, 2024). More violations lower the score.

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Fair Use Statement

The data and findings in this study are free to use for noncommercial purposes. If you share or republish them, just credit Waterboy and link back to the original research. We did a lot of math for this.