# Lees Summit, MO — Drinking Water Quality (2025)

> Contaminant levels for the Lees Summit, MO public water system from its 2025 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/mo/lees-summit/2025
- JSON API: https://www.thewatermap.com/api/water/mo/lees-summit/2025
- Source: the utility's annual Consumer Confidence Report (CCR)
- Verification: transcribed by a model, cross-checked by a second model, approved before publishing
- Reporting year: 2025
- Contaminants measured: 22
- Contaminants with a federal limit: 11
- Contaminants at or above the federal limit: 1
- Part of The Water Map — https://www.thewatermap.com

## Contaminants measured

| Contaminant | Category | Measured level | Sampling context | Federal limit | Status |
|---|---|---|---|---|---|
| TTHM | Disinfection byproducts | 7 ug/L (Running annual avg) | System-wide | 80 ug/L (MCL) | Within the limit |
| Chloride | Inorganic chemicals | 25 mg/L (Highest single sample) | Sampled Result | 250 mg/L (MCL) | Within the limit |
| Fluoride | Inorganic chemicals | 0.75 mg/L (Range) | System-wide | 4 mg/L (MCL) | Within the limit |
| Sulfate | Inorganic chemicals | 178 mg/L (Range) | System-wide | 250 mg/L (MCL) | Within the limit |
| Barium | Metals | 0.0127 mg/L (Highest single sample) | Sample Result | 2 mg/L (MCL) | Within the limit |
| Calcium | Metals | 16.4 mg/L (Range) | System-wide | No federal limit | Detected — no federal limit |
| Copper | Metals | 0.006 mg/L (90th percentile) | 90th Percentile: 90% of your water utility levels were less than | 1.3 mg/L (Action level) | Within the limit |
| Lead | Metals | 0 ug/L (90th percentile) | 90th Percentile: 90% of your water utility levels were less than | 15 ug/L (Action level) | None detected |
| Lithium | Metals | 26.7–58.6 ug/L (Range) | System-wide | No federal limit | Detected — no federal limit |
| Magnesium | Metals | 19.9 mg/L (Highest single sample) | Sampled Result | No federal limit | Detected — no federal limit |
| Potassium | Metals | 6 mg/L (Range) | System-wide | No federal limit | Detected — no federal limit |
| Selenium | Metals | 1.95 ug/L (Range) | System-wide | 50 ug/L (MCL) | Within the limit |
| Sodium | Metals | 50 mg/L (Highest single sample) | Sampled Result | No federal limit | Detected — no federal limit |
| Total Coliform | Microbial | 0.96 (Reported level) | System-wide | No federal limit | Detected — no federal limit |
| Perfluorobutanesulfonic acid | PFAS ("forever chemicals") | 2 (Reported level) | Water System Name | No federal limit | Detected — no federal limit |
| PFOA | PFAS ("forever chemicals") | 0–2 (Range) | System-wide | No federal limit | Detected — no federal limit |
| PFOS | PFAS ("forever chemicals") | 2 (Reported level) | Water System Name | No federal limit | Detected — no federal limit |
| Alkalinity | Physical & aggregate | 158–216 mg/L (Range) | System-wide | No federal limit | Detected — no federal limit |
| Hardness | Physical & aggregate | 123 mg/L (Range) | System-wide | No federal limit | Detected — no federal limit |
| pH | Physical & aggregate | 9.65 (Range) | System-wide | 8.5 (MCL) | At or above the limit |
| Total Dissolved Solids | Physical & aggregate | 340 mg/L (Highest single sample) | Sampled Result | 500 mg/L (MCL) | Within the limit |
| Atrazine | VOCs & pesticides | 0–0.267 ug/L (Range) | System-wide | 3 ug/L (MCL) | Within the limit |

## What these contaminants are

- **TTHM** — Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
- **Chloride** — A naturally occurring salt compound. Regulated only as a secondary (cosmetic) standard; high levels cause a salty taste and can corrode pipes.
- **Fluoride** — A mineral often added to drinking water to help prevent tooth decay. Beneficial at low levels, but long-term exposure above the federal limit can cause bone disease and tooth mottling.
- **Sulfate** — A naturally occurring mineral from rock and soil. No health-based federal limit; high levels can have a laxative effect and a bitter taste.
- **Barium** — A metal from erosion of natural deposits and industrial discharge. Long-term exposure above the federal limit can raise blood pressure.
- **Calcium** — A naturally occurring mineral that contributes to water hardness. Not federally regulated for health; affects scaling and taste.
- **Copper** — A metal that enters water from corroding household plumbing. Short-term exposure causes stomach distress; long-term exposure can damage the liver and kidneys.
- **Lead** — A toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. There is no safe level of lead; it harms brain development in children and raises blood pressure in adults. The EPA sets an action level, not a health goal above zero.
- **Lithium** — A naturally occurring element found in some groundwater. No enforceable federal limit; on the EPA contaminant candidate list for further study.
- **Magnesium** — A naturally occurring mineral that contributes to water hardness. Not federally regulated for health; affects scaling and taste.
- **Potassium** — A naturally occurring mineral from rock and soil. Not federally regulated for health.
- **Selenium** — A trace element from natural deposits and industrial discharge. Essential in tiny amounts, but long-term exposure above the federal limit can cause hair and fingernail loss and circulatory problems.
- **Sodium** — A naturally occurring salt component. Not federally regulated for health; relevant for people on sodium-restricted diets.
- **Total Coliform** — A group of bacteria used as an indicator of overall water-system sanitation. Coliforms themselves are usually harmless, but their presence signals that disease-causing organisms could enter the system.
- **Perfluorobutanesulfonic acid** — Perfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' Has no standalone limit but is part of the EPA PFAS Hazard Index that limits PFAS in combination.
- **PFOA** — Perfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. Linked to cancer, liver damage, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
- **PFOS** — Perfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. Linked to cancer, thyroid disease, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
- **Alkalinity** — A measure of the water's capacity to neutralize acids. Not federally regulated for health; relevant to corrosion control and treatment.
- **Hardness** — A measure of dissolved calcium and magnesium minerals. Not federally regulated for health; affects scaling, soap use, and taste.
- **pH** — A measure of how acidic or basic the water is. Regulated only as a secondary standard; very low or high pH can corrode pipes or affect taste.
- **Total Dissolved Solids** — Total dissolved solids — the combined content of all dissolved minerals and salts. Regulated only as a secondary (cosmetic) standard; high levels affect taste and hardness.
- **Atrazine** — A widely used agricultural herbicide that reaches water through runoff. Long-term exposure above the federal limit can affect the cardiovascular and reproductive systems.

## How to read this

- A water-quality report covers an entire service area, not a single address.
- 'Federal limit' is the EPA standard (MCL, action level, treatment technique, etc.) that the measured level is compared against.
- 'At or above the federal limit' means the utility's own reported figure met or exceeded that standard.

_Figures are the utility's own published numbers. Generated 2026-05-25 from thewatermap.com._