Drinking water quality · 2025
· Verified
What's in Lees Summit, MO tap water
22 contaminants were measured in the Lees Summit, MO water system's 2025 annual report. Each is shown below against its federal limit — 1 sit at or above that limit.
- Reporting year
- 2025
- Contaminants measured
- 22
- Over federal limit
- 1
- Approaching the limit
- 0
- Worst contaminant
- pH
- Service area
- MO
PFAS — EPA UCMR5 (2023–2025)
2 PFAS compounds detected in Lees Summit, MO
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
Lithium
● Detected (no federal limit)near national p90 (76.59999999999991 mg/L across detecting U.S. systems)
PFBA
● Detected (no federal limit)below national p90 (18 ng/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
Lees Summit, MO buys its drinking water from INDEPENDENCE PWS, KANSAS CITY PWS, and 3 more.
Source
Treatment
Distribution
Also buys water from INDEPENDENCE PWS, KANSAS CITY PWS, and 3 more.
Historical readings · EPA Six-Year Review (2012–2019)
10 historically-detected contaminants in Lees Summit, MO
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
HAA5 worst: 2014 | 0.0348 mg/L within | 0.06 mg/L | '12'13'14'15'16'17'18'19 |
TTHM worst: 2014 | 0.0189 mg/L within | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
COPPER worst: 2014 | 0.0354 mg/L below national p90 | — | '14'17 |
LEAD worst: 2014 | 0.0101 mg/L | — | '14'17 |
DCAA worst: 2012 | 0.0178 mg/L | — | '12'13'14'15'16'17'18'19 |
MBAA worst: 2014 | 0.00449 mg/L | — | '14 |
MCAA worst: 2014 | 0.00562 mg/L | — | '14 |
TCAA worst: 2012 | 0.00154 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMODICHLOROMETHANE worst: 2012 | 0.00086 mg/L | — | '12'13'14'15'16'17'18'19 |
CHLOROFORM worst: 2012 | 0.00858 mg/L | — | '12'13'14'15'16'17'18'19 |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| pHA measure of how acidic or basic the water is. | 9.65RangeSystem-wide | 8.5MCL | At or above the limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 340 mg/LHighest single sampleSampled Result | 500 mg/LMCL | Within the limit |
| AlkalinityA measure of the water's capacity to neutralize acids. | 158–216 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| HardnessA measure of dissolved calcium and magnesium minerals. | 123 mg/LRangeSystem-wide | None set | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| SulfateA naturally occurring mineral from rock and soil. | 178 mg/LRangeSystem-wide | 250 mg/LMCL | Within the limit |
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.75 mg/LRangeSystem-wide | 4 mg/LMCL | Within the limit |
| ChlorideA naturally occurring salt compound. | 25 mg/LHighest single sampleSampled Result | 250 mg/LMCL | Within the limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| AtrazineA widely used agricultural herbicide that reaches water through runoff. | 0–0.267 ug/LRangeSystem-wide | 3 ug/LMCL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| SeleniumA trace element from natural deposits and industrial discharge. | 1.95 ug/LRangeSystem-wide | 50 ug/LMCL | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.0127 mg/LHighest single sampleSample Result | 2 mg/LMCL | Within the limit |
| CalciumA naturally occurring mineral that contributes to water hardness. | 16.4 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 19.9 mg/LHighest single sampleSampled Result | None set | Detected — no federal limit |
| PotassiumA naturally occurring mineral from rock and soil. | 6 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 50 mg/LHighest single sampleSampled Result | None set | Detected — no federal limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0.96Reported levelSystem-wide | None set | Detected — no federal limit |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | 2Reported levelWater System Name | None set | Detected — no federal limit |
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 0–2RangeSystem-wide | None set | Detected — no federal limit |
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | 2Reported levelWater System Name | None set | Detected — no federal limit |
People also ask about Lees Summit, MO's water
+Is Lees Summit, MO tap water safe to drink in 2025?
The 2025 Consumer Confidence Report for the Lees Summit, MO water utility lists 1 contaminant at or above the federal limit: pH. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Lees Summit, MO tap water?
22 contaminants were measured in Lees Summit, MO's 2025 Consumer Confidence Report, spanning metals, physical & aggregate, and inorganic chemicals. 11 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Lees Summit, MO tap water?
One contaminant in Lees Summit, MO's 2025 report sits at or above the federal limit: pH (1.1× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Lees Summit, MO tap water?
The contaminant with the highest measured value relative to its federal limit in the 2025 report is pH, at 1.1× the federal threshold. It belongs to the physical & aggregate family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Lees Summit, MO's 2025 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Lees Summit, MO's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2025 report; a new report will replace it once the utility publishes its next annual update.