Paragraph 2A F1F2
Each monitoring programme must include an operational monitoring programme that—
takes into account any parameter, or micro-organism, parasite or substance, identified as relevant—
by virtue of regulation 5(2), or
through a risk assessment under regulation 30,
where appropriate, includes monitoring of parameters in accordance with sub-paragraphs (2) and (3), and
confirms the effectiveness of all measures in place to control risks to human health throughout the water supply chain (from the catchment area through abstraction, treatment and storage to distribution).
Except where turbidity is caused by iron and manganese in groundwater sources, the operational monitoring programme must include monitoring of the parameter turbidity at the treatment works in accordance with the reference values and frequencies in the following table—
| Operational parameter | Reference value | Minimum frequency of sampling and analysis | ||
|---|---|---|---|---|
| Turbidity at the treatment works | 0.3 NTU in 95% of samples and none to exceed 1 NTU | Volume (m3) of water distributed or produced each day within a supply zone | ||
| > 0 | ≤ 1,000 | Weekly | ||
| > 1,000 | ≤ 10,000 | Daily | ||
| > 10,000 | Continuous | |||
The operational monitoring programme must include monitoring of somatic coliphages in raw water in accordance with the following table—
| Operational parameter | Reference value | Unit | Notes |
|---|---|---|---|
| Somatic coliphages | 50 (for raw water) | PFU/100ml | This parameter must be measured if the risk assessment under regulation 30 indicates that it is appropriate to do so. If it is found in raw water at concentrations > 50 PFU/100ml, it must be analysed after steps of the treatment train in order to determine log removal by the barriers in place and to assess whether the risk of a breakthrough of pathogenic viruses is sufficiently under control. |
In this paragraph—
“NTU” means Nephelometric Turbidity Unit, and
“PFU” means Plaque Forming Unit.
Annotations
Textual amendments
- F1
Sch. 1A inserted (27.10.2017) by The Public Water Supplies (Scotland) Amendment Regulations 2017 (S.S.I. 2017/281), reg. 1(1), sch. 1 (as amended by The Public and Private Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2017 (S.S.I. 2017/321), regs. 1, 3(2))
- F2
Sch. 1A Pt. A para. 2A inserted (1.1.2023) by The Public Water Supplies (Scotland) Amendment Regulations 2022 (S.S.I. 2022/387), regs. 1(1), 17(2)(a)