Is Corpus Christi, TX Tap Water Safe to Drink?

Where Does Corpus Christi Get Its Water?

Corpus Christi, TX draws its drinking water through a system operated primarily by the City of Corpus Christi, with additional supply from Nueces County Water Control and Improvement Districts 3 and 4, and a separate system serving the Corpus Christi Naval Air Station. Together these utilities cover the metropolitan area and surrounding communities.

The Stevens Water Treatment Plant is one of the major recognizable facilities treating water for the city. A membrane plant also plays a significant role in the treatment infrastructure, and the Beasley and Mustang pump stations move treated water through the distribution system.

The Nueces County districts serve portions of the broader service area outside the city core, providing water to residents in those surrounding communities. Each system operates under EPA oversight and is subject to the same federal water quality standards.

How Is Corpus Christi Tap Water Treated?

Water in Corpus Christi goes through several treatment steps before reaching your tap. The process includes coagulation, filtration, and advanced membrane filtration at dedicated facilities. Additional steps such as adsorption and disinfection byproduct control are also part of the treatment train, helping remove particles and reduce certain contaminants.

Disinfection uses a combination of methods including free chlorine and other disinfectant approaches to kill bacteria and viruses. This keeps the water microbiologically safe through the distribution system, though it can contribute to minor taste or odor that some residents notice.

The membrane plant specifically provides an additional layer of filtration capable of removing very fine particles and some dissolved contaminants. This type of advanced treatment is more common in systems facing challenging source water conditions or elevated contaminant levels.

What's in Corpus Christi Tap Water?

The primary concern in Corpus Christi tap water is lithium. EPA testing found lithium at a peak level of 27.4 micrograms per liter, which is nearly three times above EPA's health reference level of 10 micrograms per liter. Detections were recorded across all 31 ZIP codes in the dataset. It is important to note that no federally enforceable maximum contaminant level for lithium in drinking water currently exists; the 10 microgram per liter figure is a non-regulatory health reference benchmark.

Several PFAS compounds were also detected, including PFBA at a peak of 0.012 micrograms per liter, as well as PFTrDA, 8:2 FTS, and 6:2 FTS each detected near their reporting thresholds. None of these PFAS detections exceeded their respective EPA limits or screening benchmarks based on available data, so they do not currently represent a compliance concern.

Lithium in drinking water typically originates from natural geological sources, as it occurs in rocks and soils through which groundwater passes or surface water runoff contacts. Its presence in Corpus Christi water is likely tied to the regional geology rather than industrial contamination.

Health Risk Profile for Corpus Christi

The lithium level measured in Corpus Christi tap water, peaking at 27.4 micrograms per liter, is above EPA's health reference level of 10 micrograms per liter. This benchmark is not an enforceable federal safety limit but reflects a level at which health agencies consider more study or caution to be warranted. No federal maximum contaminant level for lithium in drinking water has been established.

Infants, pregnant individuals, and people with kidney conditions or thyroid disorders may be at higher risk from elevated lithium exposure through drinking water. Infants fed formula mixed with tap water face greater exposure relative to their body weight. Individuals in these groups may want to consult a healthcare provider and consider point-of-use filtration.

For Corpus Christi, a reverse osmosis filter certified to NSF/ANSI 58 (NSF/ANSI is an independent third-party certification label you can look for on the product box) is the most effective option for reducing lithium and PFAS compounds. Since PFAS were also detected, look for a filter that additionally carries NSF/ANSI P473 certification, which specifically covers PFOA and PFOS reduction. Certified products are listed at nsf.org.

The PFAS detected in Corpus Christi water are currently below the levels that triggered EPA's 2024 enforceable limits for the more regulated compounds like PFOA and PFOS. Science on some of the newer PFAS variants such as PFBA is still developing, and EPA continues to evaluate health effects at low concentrations.