The 10,000th visitor has walked through the gates of Myponga Reservoir Reserve since it was opened for recreation in April.
It was the first reservoir opened for recreational access in a state government bid to drive regional tourism, encourage community wellbeing and promote water quality and environmental education.
Minister for Environment and Water David Speirs said it was great to see South Australians enjoy the space and take pride in it.
"To have 10,000 people visit Myponga Reservoir is an outstanding result and shows that South Australians are voting with their feet when it comes to opening up our reservoirs for recreational activities," he said.
He said opening the reserve to more people was having a positive economic impact on the Myponga township and wider Fleurieu Peninsula, "with increased tourism driving more dollars into local businesses".
"The Smiling Samoyed Brewery and Myponga General Store have since had huge uplifts in turnover, with the brewery experiencing its biggest day of sales on the opening day of public access to the reservoir," he said.
Mr Speirs said a cross-government taskforce had continued to ensure the health and quality of the drinking water from the reservoir was not affected by the extra recreational activities in the area.
"Importantly we have had no incidents where drinking water safety has been compromised as a result of recreational activities in the nearly six months since the opening of Myponga Reservoir, demonstrating our long held view that risks can be effectively managed in partnership with SA Health," he said.