| Parameter | Frequency |
|---|---|
| Chlorine residual | Continuous monitoring |
| Turbidity | Continuous monitoring |
| pH | Continuous monitoring |
| Total coliform bacteria | Monthly |
| Disinfection by-products | Quarterly (Carson), Annually (Underwood) |
| Nitrate | Annually |
| Copper | Every 3 years |
| Lead | Every 3 years |
| Pesticides | Every 3 years |
| Volatile organic compounds | Every 3 years (Carson) Every 6 years (Underwood) |
| Radionuclides | Every 6 years |
| Asbestos | Every 9 years |
| Herbicides | Every 9 years |
| Inorganic chemicals | Every 9 years |
