# Lewisville, TX — Drinking Water Quality (2024)

> Contaminant levels for the Lewisville, TX public water system from its 2024 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/tx/lewisville/2024
- JSON API: https://www.thewatermap.com/api/water/tx/lewisville/2024
- 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: 2024
- Contaminants measured: 28
- Contaminants with a federal limit: 19
- 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 |
|---|---|---|---|---|---|
| Bromate | Disinfection byproducts | 5.5 ug/L (Running annual avg) | System-wide | 0 ug/L (MCLG) | Detected — no federal limit |
| Bromodichloromethane | Disinfection byproducts | 4 ug/L (Average) | System-wide | 0 ug/L (MCLG) | Detected — no federal limit |
| Bromoform | Disinfection byproducts | 1.36 ug/L (Average) | System-wide | 0 ug/L (MCLG) | Detected — no federal limit |
| Chloroform | Disinfection byproducts | 3.17 ug/L (Average) | System-wide | 70 ug/L (MCLG) | Within the limit |
| Dibromochloromethane | Disinfection byproducts | 4.07 ug/L (Average) | System-wide | 60 ug/L (MCLG) | Within the limit |
| HAA5 | Disinfection byproducts | 14.2 ug/L (Running annual avg) | System-wide | 60 ug/L (MCL) | Within the limit |
| TTHM | Disinfection byproducts | 22.7 ug/L (Running annual avg) | System-wide | 80 ug/L (MCL) | Within the limit |
| Chloride | Inorganic chemicals | 36.23 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Cyanide | Inorganic chemicals | 99 ug/L (Reported level) | System-wide | 200 ug/L (MCLG) | Within the limit |
| Fluoride | Inorganic chemicals | 0.65–706 mg/L (Range) | System-wide | 4 mg/L (MCLG) | At or above the limit |
| Nitrate | Inorganic chemicals | 0.563–0.8 mg/L (Range) | System-wide | 10 mg/L (MCLG) | Within the limit |
| Nitrite | Inorganic chemicals | 0.01–0.017 mg/L (Range) | System-wide | 1 mg/L (MCLG) | Within the limit |
| Sulfate | Inorganic chemicals | 74.2 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Aluminum | Metals | 0.012 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Arsenic | Metals | 0–1.5 ug/L (Range) | System-wide | 0 ug/L (MCLG) | Detected — no federal limit |
| Barium | Metals | 0.036 mg/L (Reported level) | System-wide | 2 mg/L (MCLG) | Within the limit |
| Chromium, Total | Metals | 1–2.7 ug/L (Range) | System-wide | 100 ug/L (MCLG) | Within the limit |
| Copper | Metals | 0.26 mg/L (90th percentile) | At the tap | 1.3 mg/L (MCLG) | Within the limit |
| Lead | Metals | 0 ug/L (90th percentile) | At the tap | 0 ug/L (MCLG) | None detected |
| Manganese | Metals | 0.003 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Sodium | Metals | 32.77 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Alkalinity | Physical & aggregate | 104.7 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Bicarbonate | Physical & aggregate | 104.7 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Hardness | Physical & aggregate | 162 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Gross Beta Particle Activity | Radionuclides | 6.2 pCi/L (Reported level) | System-wide | 0 pCi/L (MCLG) | Detected — no federal limit |
| Radon | Radionuclides | Not detected pCi/L (Range) | System-wide | No federal limit | None detected |
| Atrazine | VOCs & pesticides | 0.1–0.2 ug/L (Range) | System-wide | 3 ug/L (MCLG) | Within the limit |
| Simazine | VOCs & pesticides | 0.07–0.15 ug/L (Range) | System-wide | 4 ug/L (MCLG) | Within the limit |

## What these contaminants are

- **Bromate** — A disinfection byproduct formed when bromide-containing water is treated with ozone. Classified as a probable human carcinogen; the EPA sets a strict maximum contaminant level.
- **Bromodichloromethane** — A trihalomethane disinfection byproduct. Counted within regulated total trihalomethanes; long-term exposure is associated with cancer and reproductive effects.
- **Bromoform** — A trihalomethane disinfection byproduct. Counted within regulated total trihalomethanes; long-term exposure is associated with liver and kidney effects.
- **Chloroform** — A trihalomethane formed when chlorine reacts with organic matter in water. A component of regulated total trihalomethanes; long-term exposure is linked to liver and kidney effects.
- **Dibromochloromethane** — A trihalomethane disinfection byproduct. Part of regulated total trihalomethanes; long-term exposure is linked to nervous-system, liver, and kidney effects.
- **HAA5** — Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. Long-term exposure above the federal limit is associated with an increased cancer risk.
- **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.
- **Nitrate** — A compound from fertilizer runoff, septic systems, and erosion of natural deposits. Levels above the federal limit can cause 'blue baby syndrome,' a serious oxygen-transport condition in infants.
- **Nitrite** — A compound from fertilizer runoff, sewage, and erosion of natural deposits. Like nitrate, elevated levels can cause 'blue baby syndrome' in infants.
- **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.
- **Aluminum** — A common element sometimes used as a treatment coagulant. Regulated only as a secondary (cosmetic) standard; high levels can discolor water.
- **Arsenic** — A naturally occurring element that also enters water from industry and agriculture. A known human carcinogen; long-term exposure is linked to skin, bladder, and lung cancer.
- **Barium** — A metal from erosion of natural deposits and industrial discharge. Long-term exposure above the federal limit can raise blood pressure.
- **Chromium, Total** — Total chromium — the sum of all chromium forms, from natural deposits and industrial discharge. Long-term exposure above the federal limit can cause allergic dermatitis; includes hexavalent chromium.
- **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.
- **Manganese** — A naturally occurring metal from soil and rock. No enforceable federal limit; high levels stain fixtures and laundry and can affect taste, with a health advisory for infants.
- **Sodium** — A naturally occurring salt component. Not federally regulated for health; relevant for people on sodium-restricted diets.
- **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.
- **Gross Beta Particle Activity** — Gross beta particle activity — a combined measure of beta-emitting radioactive substances. Long-term exposure above the federal screening level increases cancer risk.
- **Radon** — A naturally occurring radioactive gas that can dissolve into groundwater. No enforceable federal limit in drinking water yet; inhalation of released radon raises lung-cancer risk.
- **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._