Is Leavenworth, KS tap water safe?
The short answer
None of the 5 utilities serving Leavenworth has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Kansas’s records.
Leavenworth Water Department, which serves the most people here, has 1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 130 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.
The water from Leavenworth Water Department is moderately hard to hard depending on the source, 120 to 150 mg/L (7 to 8.8 grains per gallon). How Kansas’s water compares.
A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Leavenworth’s ZIP codes, from EPA’s estimates.
- Open report
Leavenworth Water Department
Kansas · serves 38,757 people · about 9,800 in Leavenworth
1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 130 ppb, above EPA’s health benchmark. Hardness: moderately hard to hard depending on the source, 120 to 150 mg/L (7 to 8.8 grains per gallon).
No health-based violations since 2016
- Open report
Leavenworth Co RWD 8
Kansas · serves 2,500 people · about 460 in Leavenworth
Nothing in its records is above a health goal.
No health-based violations since 2016
- Open report
Leavenworth Co RWD 5c
Kansas · serves 780 people · about 100 in Leavenworth
Nothing in its records is above a health goal.
No health-based violations since 2016
- Open report
Jefferson Co RWD 12
Kansas · serves 3,635 people · under 100 in Leavenworth
2 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 58 ppb, above EPA’s health benchmark. Hardness: very hard, typically 263 mg/L (15.4 grains per gallon).
No health-based violations since 2016
- Open report
Leavenworth Co RWD 2
Kansas · serves 483 people · under 100 in Leavenworth
1 result above the health goal. The worst: Lead at 1.4 ppb, above the health goal.
No health-based violations since 2016
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in Leavenworth Water Department’s water, which serves the most people here. Another utility’s report names what handles its own results.
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Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Arsenic
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Brondell Capella RC250 Reverse Osmosis System
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Water testing near Leavenworth
The 3 labs Kansas certifies closest to Leavenworth, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Water District No 1 of Johnson County-WaterOne
Kansas City, KS · about 22 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
KC Water Services Laboratory
Kansas City, MO · about 24 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals
Eurofins Kansas City
Lenexa, KS · about 28 miles
Certified for bacteria
Which ZIP codes are in Leavenworth: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: Kansas Department of Health and Environment, drinking water labs, as listed in TNI LAMS; distances from the Census 2020 ZIP code tabulation area gazetteer.
Near Leavenworth
Towns nearby with a page of their own.
What to do next
- Read Leavenworth Water Department’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About LithiumWhat it does to health, where it comes from, and the certification claim that addresses it.About Lithium
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water