# Round Rock, TX — Drinking Water Quality (2024)

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

- Page: https://www.thewatermap.com/water/tx/round-rock/2024
- JSON API: https://www.thewatermap.com/api/water/tx/round-rock/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: 11
- Contaminants with a federal limit: 9
- Contaminants at or above the federal limit: 0
- Part of The Water Map — https://www.thewatermap.com

## Contaminants measured

| Contaminant | Category | Measured level | Sampling context | Federal limit | Status |
|---|---|---|---|---|---|
| Chloramine | Disinfectants | 1.99 mg/L (Average) | System-wide | 4 mg/L (MRDL) | Within the limit |
| Bromodichloromethane | Disinfection byproducts | 8.3 ug/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| HAA5 | Disinfection byproducts | 14.6 ug/L (Running annual avg) | Max LRAA | 60 ug/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | 0.73 mg/L (Average) | System-wide | 10 mg/L (MCL) | Within the limit |
| Copper | Metals | 0.003 mg/L (90th percentile) | At the tap | 1.3 mg/L (Action level) | Within the limit |
| PFBA | PFAS ("forever chemicals") | Not detected ug/L (Range) | System-wide | 0.005 ug/L (MCL) | None detected |
| TOC | Physical & aggregate | 2.87 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Total Dissolved Solids | Physical & aggregate | 239 mg/L (Average) | System-wide | 1000 mg/L (MCL) | Within the limit |
| Turbidity | Physical & aggregate | 0.065 NTU (Average) | System-wide | 0.3 NTU (MCL) | Within the limit |
| Combined Radium | Radionuclides | Not detected pCi/L (Average) | System-wide | 5 pCi/L (MCL) | None detected |
| Atrazine | VOCs & pesticides | 0.5 ug/L (Average) | System-wide | 3 ug/L (MCL) | Within the limit |

## What these contaminants are

- **Chloramine** — A longer-lasting disinfectant made by combining chlorine with ammonia. Holds disinfection further into the pipe network, but is regulated under the same residual-disinfectant cap as chlorine.
- **Bromodichloromethane** — A trihalomethane disinfection byproduct. Counted within regulated total trihalomethanes; long-term exposure is associated with cancer and reproductive 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.
- **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.
- **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.
- **PFBA** — Perfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.' Monitored under EPA rules; persistent in the environment and the human body.
- **TOC** — Total organic carbon — a measure of organic material dissolved in the water. Not harmful itself, but it is the raw material that forms disinfection byproducts; removal is a treatment requirement.
- **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.
- **Turbidity** — A measure of cloudiness from suspended particles in the water. High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.
- **Combined Radium** — Combined radium-226 and radium-228 — naturally occurring radioactive elements. Long-term exposure above the federal limit increases the risk of bone cancer.
- **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._