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Water Quality Division > Programs > Public Water Supply > Phase II/V Website Data

Phase II/V Waiver Program

Overview:

The purpose of the Phase II/V Rule is to protect public health by minimizing exposure levels to 13 inorganic chemicals (IOCs), 21 volatile organic compounds (VOCs), 29 synthetic organic chemicals (SOCs), as well as numerous unregulated chemicals.

Public Health benefits include:

  • Reduction in risk of exposure to these chemicals which can cause organ and neurologic damage, cancer, and death.


Monitoring requirements:

The number and frequency of sampling for Phase II/V monitoring is based on recent phase II/V sample results and usage of certain chemicals near the source.
Sample Results: Sample results are evaluated against the maximum contaminant level (MCL) as set by the US EPA or ODEQ.

Sample Results:

Sample results are evaluated against the maximum contaminant level (MCL) as set by the US EPA or ODEQ.


Sample Points:

Samples are to be collected at the entry point to the distribution system representative of each well after treatment

Initial Monitoring:

Initial monitoring frequency is based on a combination of the source of the system and the regulated contaminant.

               IOCs:     Groundwater systems – Triennially            Surface Water:   Annually for first 3-years

               VOCs:    Quarterly for first 4 quarters

               SOCs:     Quarterly for first 4 quarters

Waiver Monitoring:

Waiver monitoring is issued by the entry point sampling point, and a system must complete the appropriate waiver form included in the phase II/V waiver packet. These waivers must be renewed every 3 years.

IOCs:     “Sampling results waiver” form must be filled out after SW systems have monitored annually for three years and GW systems must have conducted a minimum of three rounds of monitoring. The system will then be reduced to the monitoring frequency of once per 3 years. To remain on a waiver, systems must complete a “continuance of waiver” form every 3 years and take one sample in that time frame.

VOCs:    Systems may receive a “sampling results waiver” if the contaminant is not detected in initial sampling period, or after 3 years of annual sampling. A system on reduced monitoring must fill out the “continuance of waiver” form every 3 years and groundwater systems must sample once every 6 years. Surface water systems must sample once every 3 years.

SOCs:     Systems granted waivers are not required to sample. Systems must fill out the SOC “use waiver form” for each source. A system on reduced monitoring must fill out the “continuance of waiver” form every 3 years.

In the event of an MCL violation:

       All: Increased monitoring of 1 sample per quarter


Compliance Determination:

Compliance is based on running annual average (RAA). If the RAA exceeds MCL, monitoring will revert to routine monitoring.

 

Phase II/V Monitoring Waiver Packet

 

For more information about the Phase II/V Waiver Program, please contact drinkingwater@deq.ok.gov.