| Parameter | Location | Frequency | ||
| Variable source | Stable source | Ideal | ||
| Organic color (true color) | Raw and treated | Daily | Weekly | Online |
| UV absorbance (at 254 nm, UV254) | Raw and filtereda | Daily | Weekly | Online |
| Chemical oxygen demand (COD) | Raw, treatment processesb and treated | Daily | Weekly | Online |
| Dissolved or total organic carbon (DOC or TOC) | Raw and treateda | Weekly | Monthly | Online |
| Specific UV absorbance (SUVA)―calculate from UV254 and DOC | Raw and treateda | Weekly | Monthly | Daily |
| Inorganic compounds that can enhance the reactivity of NOM to form DBPs: |
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| Ammonia | Raw and treated | Quarterly | Quarterly | Quarterly |
| Bromide | Quarterly | Quarterly | Quarterly | |
| Iodide | Quarterly | Quarterly | Quarterly | |
| Sulphur | Quarterly | Quarterly | Quarterly | |
| Coagulant demand | Coagulation processc | Daily | Daily | Online |
| Zeta potential or streaming current―when NOM controls or influences coagulant dose | Coagulation processc | Online | Online | Online |
| Disinfection by-products (DBPs) | Distribution system | Quarterly (measure DOC and inorganic compounds on same day to calculate specific DBP yields to assess NOM reactivity) | ||
| Biological stability: |
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| Disinfectant residual | Distribution system | Weekly | Weekly | Online |
| Biofilm formation rate―measured by adenosine triphosphate (ATP) accumulated on mild steel coupons | Every two weeks | Monthly |
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| Corrosion rate―measured by linear polarization resistance using mild steel coupons | Monthly | Monthly |
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| Influence of NOM on corrosion: |
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| Lead | In accordance with corrosion control program | |||
| Copper | In accordance with corrosion control program | |||