San Diego County has wrapped up its investigation into a cryptosporidiosis exposure at the Gaylord Pacific Resort's pools, spas, and water park in Chula Vista, confirming three laboratory-confirmed cases and a fourth reported by a family member. All of the resort's water features have fully reopened following disinfection.
According to SanDiegoCounty
, resort guests began reporting illnesses after visiting the pools starting July 24, and the exposure window for anyone who used the facilities ran through August 15. The Gaylord Pacific closed all of its pools on August 25 after a county alert, then began a CDC-recommended hyperchlorination treatment that same day. County inspectors visited the resort on August 26, 27, and 28, verifying that proper disinfection procedures had been completed before clearing all pools, spas, and water park features to reopen on August 28.
Cryptosporidiosis is a gastrointestinal illness caused by a microscopic, chlorine-tolerant parasite that can cause watery diarrhea. County officials have said anyone with severe or worsening symptoms should contact their medical provider or call 211. The resort offers day passes and opportunities for community members to use its water play area.
Why Standard Chlorine Wasn't Enough
The parasite's resilience is exactly why a routine pool cleaning wouldn't cut it; the resort used hyperchlorination to address the contamination.
Cryptosporidium can affect disinfected recreational water venues, including pools and splash pads. The hyperchlorination treatment at Gaylord Pacific included boosting chlorine to elevated levels while also inspecting and cleaning pool filters, maintaining the chemical spike until the water met safety standards. The resort reopened after the disinfection process was completed.
A Flagship Resort Under Scrutiny
The outbreak lands at a high-profile address. The $1.3 billion Gaylord Pacific Resort & Convention Center opened in May 2025 as the sixth property in Marriott's Gaylord Hotels portfolio and the brand's first West Coast location, according to LODGING Magazine. Its 1,600-room footprint anchors the Chula Vista Bayfront, and its aquatic facility alone spans 4.25 acres, featuring multiple pools, waterslides, a wave pool, and a lazy river.
That scale is part of what makes contamination hard to catch early. Because Cryptosporidium tolerates chlorine so well, initial contamination can spread undetected until swimmers start reporting symptoms — which appears to be exactly what happened here over the three-week exposure window. High visitor volume compounds the risk: the water park's popularity is driven in part by $12.50 local day passes for Chula Vista residents that sell out online months in advance, per Voice of San Diego. It remains unclear how many additional undetected cases may exist among the resort's heavy turnover of guests and day-pass visitors during that window.
Part of a Bigger Bayfront Bet
The resort sits at the center of the Chula Vista Bayfront master development, a public-private partnership between the Port of San Diego, the City of Chula Vista, and RIDA Development that's projected to generate 4,000 permanent jobs and $475 million in annual local economic impact. The project has drawn steady attention this year, from a holiday ice event debut at the resort to new commercial growth nearby. A direct ferry service launched in May 2026, connecting downtown San Diego to Safe Harbor South Bay, within walking distance of the resort, in just 45 minutes, expanding public access to the area ahead of the summer season that ultimately saw the outbreak.
San Diego County's Environmental Health Department can be reached at [email protected] for questions related to the investigation, and the county's pool program can be reached at 858-505-6900. Anyone who visited the Gaylord Pacific pools, spas, or water park between July 24 and August 15 and experienced symptoms is encouraged to seek medical guidance.
