Is Austin, TX Tap Water Safe to Drink?

Where Does Austin Get Its Water?

Austin, TX is served by more than a dozen public water systems. The largest is Austin Water, the city's municipal utility, which provides water to the majority of residents. Several smaller utilities, including Brushy Creek MUD, West Travis County Public Utility Agency, Manville WSC, Creedmoor-Maha WSC, and others, serve specific neighborhoods and outlying areas.

Austin Water operates multiple treatment plants that process water before it reaches your tap. The Ullrich Water Treatment Plant and the Davis Water Treatment Plant are two of the major recognizable facilities in the system. Additional smaller plants such as Handcox WTP, Brownsboro WTP, Big Dale WTP, and McMahan WTP serve parts of the broader service area.

Some areas are served by groundwater sources through well fields, while the main city system draws primarily on surface water. The mix of source types across utilities means not every neighborhood's water follows the exact same treatment path.

How Is Austin Tap Water Treated?

Austin Water uses a multi-step treatment process. Raw water goes through coagulation to clump together particles, followed by filtration to remove solids. Several facilities also use granular activated carbon, powdered activated carbon, and membrane filtration to address a wider range of contaminants before water enters the distribution system.

Disinfection in the Austin area includes free chlorine and chloramine options depending on the utility and facility. These disinfectants kill bacteria and viruses and help keep the water safe as it travels through miles of pipes to your home. A small residual disinfectant is intentionally present when the water reaches your tap.

Additional treatment steps documented for various facilities include sedimentation, softening, and aeration. Smaller water systems serving outlying areas may use simpler treatment trains suited to their groundwater sources, which tend to have a different contaminant profile than surface water.

What's in Austin Tap Water?

The most widespread concern in recent EPA testing is lithium. The highest detected level was 83 micrograms per liter, which is more than eight times EPA's health reference level of 10 micrograms per liter. Lithium was detected across 64 ZIP codes, and 17 of those showed values above the health reference level. It is important to note that this reference level is a non-regulatory screening benchmark, not an enforceable federal limit, and no federal maximum contaminant level for lithium in drinking water currently exists.

Several PFAS compounds were also detected. PFPeA, a short-chain PFAS, reached a peak of 0.0054 micrograms per liter against a guideline of 0.003 micrograms per liter, with one ZIP code above that benchmark. PFTrDA was detected at 0.007 micrograms per liter, at the level of its guideline, across 48 ZIP codes. PFBA was found at 0.0065 micrograms per liter across 47 ZIP codes, though no guideline was exceeded. Another PFAS compound, 11Cl-PF3OUdS, was detected at its guideline threshold of 0.005 micrograms per liter.

Lithium in drinking water typically comes from natural geological sources, as it leaches from rocks and soil into groundwater and surface water. PFAS compounds, sometimes called forever chemicals, are synthetic substances that can enter water supplies from a variety of industrial and municipal sources and are persistent in the environment.

Health Risk Profile for Austin

Lithium is the primary concern in Austin's water. The peak detected value of 83 micrograms per liter far exceeds EPA's health reference level of 10 micrograms per liter. Again, this is a screening benchmark rather than an enforceable limit, meaning utilities are not in legal violation, but health researchers have flagged potential effects on the thyroid and developing nervous system at elevated exposures.

Infants, pregnant individuals, and people with thyroid conditions may be more sensitive to lithium in drinking water. For PFAS, children and pregnant individuals are also considered at higher risk because these compounds can accumulate in the body over time and have been linked to immune, hormonal, and developmental effects at sufficient exposure levels.

For Austin tap water, a filter certified to NSF/ANSI 58 (reverse osmosis) is the most effective option for reducing both PFAS and lithium. NSF/ANSI is an independent third-party certification program, so look for that label on the product box or in the product listing. Filters certified to NSF/ANSI P473 can also reduce PFAS, and that certification is often found on pitcher and under-sink carbon block filters. NSF/ANSI 42 certification covers taste and chlorine reduction but does not address lithium or PFAS.

The science on low-level PFAS and lithium exposure from drinking water is still developing. EPA continues to review health evidence and update guidance. For most healthy adults, the risk from current detected levels is considered low by regulators, but those in sensitive groups have good reason to consider additional filtration while research continues.