Coronavirus concerns were raised at both Blue Mountains Grammar School and Katoomba Aquatic Centre last week, after a student test positive to COVID-19 and a positive case in a visitor to the pool.
The Grammar student was among the state's positive cases reported on Saturday. The student was a close contact of a previously notified person.
All the student's close contacts were notified and asked to get tested and self-isolate.
The headmaster, Ian Maynard, posted a note on the school's website, noting that students, families and staff had been told of the confirmed case.
"The school is working closely with NSW Health to ensure they receive appropriate support," he wrote.
A local who visited the Aquatic Centre on September 4 returned a positive test on September 11.
Anyone who visited the centre on September 4 between 11.30am and 1.30pm was advised to monitor for symptoms and immediately self-isolate and get tested if symptoms developed.
Staff who worked at the pool on the day were tested but returned negative results.
Council closed the centre when it was notified of the positive finding. It reopened on Monday after the thorough deep clean over the weekend.
Publicity about the cases prompted many locals to go to the Katoomba hospital drive-through COVID-19 testing clinic, leading to significant queues.
More than 300 were tested over the weekend, according to a spokesman for Nepean Blue Mountains Local Health District. [The clinic is open 9am-12.30pm and 1-4pm seven days a week.]
The mayor, Mark Greenhill, said: "Our community needs to remain vigilant. We all need to monitor for any symptoms of COVID-19 and get tested if we are at all concerned.
"My thoughts remain with those who have been affected, including the blue Mountains Grammar School community."
Last week's positive cases were the first in the Mountains since July, when a Katoomba man who visited the Crossroads Hotel in Casula and three members of his household were infected.
