Utah Admin. Code 309-205-8
The frequency of required turbidity monitoring or the lack of any required monitoring listed below may be increased or changed by the Director. Monitoring and reporting of water characteristics such as turbidity, conductivity, pH, and temperature of ground water sources and nearby surface water sources may be required so as to provide sufficient information on water characteristics so that the Director may classify existing ground water sources as required by R309-505-7(1)(a)(i)(A).
If the result of an analysis of water from a ground water source or combination of ground water sources indicates that the turbidity limit of 5 NTUs is exceeded, the system shall collect three additional analyses at the same sampling point within one month. When the average of these four analyses (rounded to the same number of significant figures as the limit) exceeds the maximum turbidity limit, the system shall give public notice as required in R309-220. Where the raw water turbidity of developed spring or well water is in excess of 5 NTU, as measured by the average of the four samples, the spring or well is subject to re-classification by the Director and it may be necessary that the raw water receive complete treatment as described in R309-525 or R309-530 of these rules or its equivalent as approved by the Director. Monitoring after public notification shall be at a frequency and duration designated by the Director.
Utah Admin. Code R309-205-8