The Phase V Rule makes use of the Standard Monitoring Framework, which reduces the complexity of the monitoring requirements, coordinates the requirements among various regulations, and standardizes the monitoring schedules by establishing three-year monitoring periods for drinking water contaminants.
The Phase II Rule required that certain Public Water Systems (PWSs) monitor for specified unregulated contaminants by December 1995, including a number of Phase V contaminants. The final Phase V rule took advantage of this requirement and
uses the 1993-1995 initial monitoring period for all contaminants for PWSs with
150 or more service connections. Smaller systems are required to monitor during
the 1996-1998 monitoring period. States determine when, within the 3-year
monitoring period, each PWS is to monitor. Monitoring requirements are given
below in Table 1.
| Table 1. Compliance Monitoring Requirements | ||||
|---|---|---|---|---|
| Contaminant | Ground water | Surface water | Trigger that Increases Sampling | Waivers for Base Requirements |
| |
||||
| 4 Inorganic | 1 sample per 3 yr | Annual | MCL | YES based on analytical results of 3 rounds |
| 1 sample/ 9 years after 3
samples < MCL |
||||
| Cyanide | 1 Sample every 3 yr | Annual sample | MCL | YES based on Vulnerability Assessment |
| 1 sample/ 9 years after 3
samples < MCL |
||||
| 3 Volatile Organics | Quarterly/yr; annual after one year of no detects; every 3 yrs after 3 rounds (GW systems) | > 0.0005 mg/l | YES Based on Vulnerability Assessment | |
| 15 Pesticides/ Synthetic Organics | 4 quarterly samples every 3 years; after 1 round of no detects: system > 3,300 reduce to 2 samples/yr every 3 yrs, systems < 3,300 reduce to 1 sample every 3 yrs | Detection (as specified in the rule) | YES Based on Vulnerability Assessment | |
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