Most requirements are the same for large municipal systems as for small rural systems.
Construction plans are reviewed by the TDHR and must conform with their current rules and regulations. Operation and maintenance standards are surveyed by TDHR field representatives and must meet state standards. Water systems serving less than 4,000 families are required to send 4 samples per month to the TDHR for bacteriological analysis. Additional samples are required from larger systems and systems using surface water. In addition each system sends a chemical analysis sample annually.