WICHITA FALLS, Texas (AP) -

A cool dip in a private swimming pool could lead to health trouble if people in a drought-stricken North Texas city ignore water restrictions.

Wichita Falls officials on Thursday reminded pool owners who are barred from using city-treated supplies not to substitute water from lakes, ponds or even diverted rainwater. Infectious diseases such as typhoid, dysentery and salmonella can thrive in untreated water.

Stage 5 drought catastrophic rules remain in effect for Wichita Falls.

Experts say well water that's been tested for total coliforms and E. coli is allowed. If water is being brought in by truck, pool owners in the city of about 100,000 should make sure that the tanks are marked as "well water" and conform to Wichita County Health District guidelines.