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Is Round Rock Water Safe to Drink?
City of Round Rock · 2023 data · official source
This is the safety page for Round Rock — how hard the water is (and what that costs) lives on the Round Rock water hardness page · see how Round Rock compares across all of Texas on the Texas hardness guide · or browse every Texas city by safety status on the Texas water quality page.
Round Rock water meets all EPA legal limits. Each of the 14 tested contaminants below sits under its limit — most by a wide margin.
The one real caveat: lead and copper usually enter from a home's own plumbing, not the treated supply. If your home was built before the mid-1950s, older service lines and solder are the thing to check — not the water coming out of the treatment plant.
Note: independent health group EWG flags 14 detected contaminant(s) as above its own much-stricter voluntary benchmark — shown in the table below as informational only, not a safety claim. Every one sits below the legal EPA limit.
Why it's safe
- ✓ Continuous monitoring — City of Round Rock tests the water around the clock for microbiological safety and routinely for chemical parameters.
- ✓ Regulated to EPA limits — enforced under EPA National Primary Drinking Water Regulations.
- ✓ Disinfected — chlorine keeps the supply safe from bacteria from the treatment plant to your tap.
What's in Round Rock's water
Detected contaminants reported for City of Round Rock (EPA system ID TX2460003).
Source: EWG tap water database (Aug 2026).
Every detected contaminant is below the health limit. Some are still above EWG's stricter voluntary health benchmarks — common nationwide, shown below.
How to read this table: the legal limit (the EPA's Maximum Contaminant Level (MCL)) is the enforceable safety line — it's what regulators actually require. The EWG guideline column is a much stricter, voluntary health benchmark (often 100–1000× lower than the legal limit). Many contaminants sit below the legal limit but above the EWG line — that's common nationwide and means the water is still legally safe, not that it's dangerous.
| Contaminant | Typical level | EPA legal limit | EWG guideline | Status |
|---|---|---|---|---|
| Bromochloroacetic acid | 4.98 ppb | unregulated | 0.02 ppb | Above EWG |
| Bromodichloromethane | 11.8 ppb | unregulated | 0.06 ppb | Above EWG |
| Bromoform | 9.95 ppb | unregulated | 0.5 ppb | Above EWG |
| Chloroform | 4.15 ppb | unregulated | 0.4 ppb | Above EWG |
| Dibromoacetic acid | 5.91 ppb | unregulated | 0.03 ppb | Above EWG |
| Dibromochloromethane | 20.3 ppb | unregulated | 0.1 ppb | Above EWG |
| Dichloroacetic acid | 3.28 ppb | unregulated | 0.2 ppb | Above EWG |
| Haloacetic acids (HAA5) | 10.3 ppb | 60 ppb | 0.1 ppb | Below limit |
| Haloacetic acids (HAA9) | 27.3 ppb | unregulated | 0.06 ppb | Above EWG |
| Nitrate | 0.324 ppm | 10 ppm | 0.14 ppm | Below limit |
| Nitrate and nitrite | 1.8 ppm | 10 ppm | 0.14 ppm | Below limit |
| Radium, combined (-226 and -228) | 0.5 pCi/L | 5 pCi/L | 0.05 pCi/L | Below limit |
| Total trihalomethanes (TTHMs) | 47.9 ppb | 80 ppb | 0.15 ppb | Below limit |
| Trichloroacetic acid | 0.986 ppb | unregulated | 0.1 ppb | Above EWG |
Levels are system-wide utility averages. The legal limit is the EPA's Maximum Contaminant Level (MCL). EWG also flags 14 contaminant(s) as exceeding its own stricter (non-legal) health guideline — shown as an informational note only, not a safety claim.
Not sure what these levels mean for your health? Read our complete contaminants guide — what's detected vs. what matters, and how to read the numbers.
What actually matters in Round Rock's water
Most of the numbers in the table are below the legal limit and aren't worth your worry. Here's the honest read on the ones people actually ask about in Round Rock:
Why the limit exists: The limit protects infants from "blue baby syndrome" (methemoglobinemia). Infants under six months convert nitrate to nitrite and lack the enzyme to reverse it, so their blood can't carry oxygen. Cases occur above 10 mg/L, not at or below.
Who it matters most for: Infants under 6 months (especially formula-fed).
Source: EPA MCL / HC MAC
Why the limit exists: The limit protects infants from "blue baby syndrome" (methemoglobinemia). Infants under six months convert nitrate to nitrite and lack the enzyme to reverse it, so their blood can't carry oxygen. Cases occur above 10 mg/L, not at or below.
Who it matters most for: Infants under 6 months (especially formula-fed).
Source: EPA MCL / HC MAC
Why the limit exists: Trihalomethanes are disinfection byproducts. Long-term exposure above the limit is associated with liver, kidney, and central nervous system problems plus an increased risk of cancer (most consistently bladder). The limit is a deliberate trade-off: you can't remove them without abandoning disinfection, which would risk far worse microbial disease.
Source: EPA MCL / HC MAC
Why the limit exists: Haloacetic acids are disinfection byproducts associated with an increased risk of cancer at sustained elevated exposure. Same trade-off as TTHMs — the limit balances cancer risk against the necessity of disinfection.
Source: EPA MCL / HC MAC
Why the limit exists: Haloacetic acids are disinfection byproducts associated with an increased risk of cancer at sustained elevated exposure. Same trade-off as TTHMs — the limit balances cancer risk against the necessity of disinfection.
Source: EPA MCL / HC MAC
Why the limit exists: Trihalomethanes are disinfection byproducts. Long-term exposure above the limit is associated with liver, kidney, and central nervous system problems plus an increased risk of cancer (most consistently bladder). The limit is a deliberate trade-off: you can't remove them without abandoning disinfection, which would risk far worse microbial disease.
Source: EPA MCL / HC MAC
Why the limit exists: Trihalomethanes are disinfection byproducts. Long-term exposure above the limit is associated with liver, kidney, and central nervous system problems plus an increased risk of cancer (most consistently bladder). The limit is a deliberate trade-off: you can't remove them without abandoning disinfection, which would risk far worse microbial disease.
Source: EPA MCL / HC MAC
Why the limit exists: Trihalomethanes are disinfection byproducts. Long-term exposure above the limit is associated with liver, kidney, and central nervous system problems plus an increased risk of cancer (most consistently bladder). The limit is a deliberate trade-off: you can't remove them without abandoning disinfection, which would risk far worse microbial disease.
Source: EPA MCL / HC MAC
Why the limit exists: Haloacetic acids are disinfection byproducts associated with an increased risk of cancer at sustained elevated exposure. Same trade-off as TTHMs — the limit balances cancer risk against the necessity of disinfection.
Source: EPA MCL / HC MAC
Why the limit exists: Trihalomethanes are disinfection byproducts. Long-term exposure above the limit is associated with liver, kidney, and central nervous system problems plus an increased risk of cancer (most consistently bladder). The limit is a deliberate trade-off: you can't remove them without abandoning disinfection, which would risk far worse microbial disease.
Source: EPA MCL / HC MAC
Why the limit exists: Haloacetic acids are disinfection byproducts associated with an increased risk of cancer at sustained elevated exposure. Same trade-off as TTHMs — the limit balances cancer risk against the necessity of disinfection.
Source: EPA MCL / HC MAC
Why the limit exists: Haloacetic acids are disinfection byproducts associated with an increased risk of cancer at sustained elevated exposure. Same trade-off as TTHMs — the limit balances cancer risk against the necessity of disinfection.
Source: EPA MCL / HC MAC
Why the limit exists: Radium is radioactive; long-term exposure is associated with an increased risk of bone cancer.
Source: EPA MCL
Why the limit exists: Haloacetic acids are disinfection byproducts associated with an increased risk of cancer at sustained elevated exposure. Same trade-off as TTHMs — the limit balances cancer risk against the necessity of disinfection.
Source: EPA MCL / HC MAC
Where Round Rock's water comes from — and how it's treated
surface water (Lake Georgetown / Edwards Aquifer / LCRA blended supply)
Like every U.S. municipal supply, Round Rock's water is disinfected and monitored against EPA National Primary Drinking Water Regulations, published annually in the Consumer Confidence Report (CCR). If you want to read the raw report for yourself, our how to read your water quality report guide walks you through it line by line.
"My Round Rock water tastes or smells like chlorine — is it still safe?"
Yes. A chlorine taste or smell doesn't mean the water is unsafe — it's the residual disinfectant doing its job (preventing bacteria from re-growing between the treatment plant and your tap). Seasonal changes, disinfection byproducts, or your own plumbing can all shift taste without affecting safety. If the taste bothers you, a simple activated-carbon pitcher filter removes it without any safety concern — the water was already safe before you filtered it.
Water quality vs. water hardness — don't confuse the two
"Water quality" (is it safe to drink) and "water hardness" (how much scale it leaves) are entirely different things — and confusing them leads to bad purchases. Round Rock's water is very hard (14.55 GPG), which has no bearing on its safety — hardness is a cosmetic and appliance concern, not a health one. For what that hardness costs you in scale, appliance wear, and water-heater efficiency, see the Round Rock water hardness page.
If contaminants concern you — add a drinking-water filter
Should you filter Round Rock's water?
The softener handles hardness; a drinking-water filter removes Nitrate and removes Radium — if Round Rock's reported levels concern you. EPA: Nitrate (above 10 mg/L as nitrogen) can cause "blue baby syndrome" (methemoglobinemia) in infants and is associated with certain cancers at sustained exposure. EPA: Radium is radioactive and long-term exposure is associated with an increased risk of bone cancer and other effects. For a full breakdown of what each filter type removes, see best whole-house water filters.
We may earn a commission when you buy through links on our site. This doesn't affect our recommendations. Full disclosure.
When to call a professional
Round Rock's water meets every legal limit, so there's nothing that requires a pro — but clean, good-tasting water is always worth a little peace of mind, and your home's plumbing is its own variable. The clearest reason to call a licensed plumber: if your home was built before the mid-1950s and may still have lead service lines or solder — the lead risk lives in your pipes, not the city's water. Beyond that, a professional can test your tap (not just the city-wide report) and tell you honestly whether any treatment would actually improve what your household drinks.
Certified, independent results come from a state/province-licensed lab, not a company with a sales incentive — ask for a lab that reports to the EPA or your state.
Frequently asked questions
Is Round Rock tap water safe to drink?
Yes. Round Rock's municipal water meets all EPA legal limits — every detected contaminant is below the limit. Lead is the main thing to watch, and it usually comes from a home's own plumbing, not the treated supply.
Who tests Round Rock's water, and how often?
City of Round Rock is required by the EPA to test and publish an annual Consumer Confidence Report (CCR), linked on this page.
Where does Round Rock drinking water come from?
surface water (Lake Georgetown / Edwards Aquifer / LCRA blended supply)
Should I filter Round Rock's tap water?
For most people, no — the water already meets all legal limits. A filter is worth considering only if you're on older plumbing (lead/copper), have a compromised immune system, or dislike the taste/chlorine.
Is Round Rock water hard?
Round Rock water is very hard at 14.55 GPG (249 ppm). Hardness is separate from safety — it affects scale and appliances, not health. See the Round Rock water hardness page for the full picture.
Sources & method
All contaminant levels are drawn from official, published data — EWG tap water database (Aug 2026) (source). We cite the legal limit for each contaminant so you never see a bare scare number.
- · City of Round Rock — water-quality report we reviewed
- · USGS — Water Hardness
- · EPA — Drinking Water Regulations
- · CDC — Drinking Water
- · EWG — Tap Water Database
- · Our complete contaminants guide (what's detected vs. what matters, how limits are set)
- · How to read your water quality report — line by line
Compare Round Rock to Other Texas Cities
How Round Rock's water quality stacks up against nearby cities — same Texas data, same legal limits.
Other Safe-to-Drink Water Cities
Round Rock is one of many cities whose water meets every health limit. Here are a few more to compare.
Explore More
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💧 Water treatment pros: this page is yours to share
This page helps customers understand what's in their water and whether they need a filter — so they can weigh whether service is worth it. We recommend sharing this page along with our complete contaminants guide in your next quote or follow-up to fully explain the value of your services.