For starter home advisor and thumbtack are both useless websites for water features. These services use landscape companies that don’t specialize in Ponds and waterfalls. If you want a pond google a pond builder, or just don’t waste your time and call me. I have way more experience than all the other pond companies in the Austin area. A pond company that has to subcontract out is not a pond company. If a pond builder is using flagstone for waterfalls then they are not pond builders. I was recently on a pond repair and the company that came out before me did the repair. It cost $1700.00 for the customer to fix with the first company and now it will cost an additional $1500.00 to fix the fix they did. I’m apologize for all other companies that have or will rip you off. I stay in business because of these companies.