R309-205-8. Turbidity

(1) Routine Monitoring Requirements for Public Water Systems utilizing Ground Water Sources

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).

(a) All community water systems shall monitor ground water sources for turbidity once every three years.

(b) Non-transient non-community water systems are not required to monitor ground water sources for turbidity unless so ordered by the Director.

(c) Transient non-community water systems are not required to monitor ground water sources for turbidity unless so ordered by the Director.

(d) Samples may be taken from a representative location in the distribution system. However, the Director may require that samples be collected from each individual source.

(2) Procedures if Ground Water Source Turbidity Limit is Exceeded

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.

(3) Turbidity monitoring requirements for surface water and ground water sources under the direct influence of surface water are specified in R309-215-9.