CCP Register Builder

v2.2

What is a CCP? A Critical Control Point is a point or step in a treatment process where control can be applied and a hazard prevented, eliminated, or reduced to an acceptable level. At each CCP you monitor a parameter against limits and act when those limits are approached.

Tell us about your plant and it builds a CCP register for you — each control point with its objective, monitoring, a three-tier limit set (target range, action limit, critical limit), corrective actions and support systems.

Critical limits come from the DWQAR 2026 where the rules set them.
Target and action limits are suggested with margin inside the critical limit — adjust to your plant.
The CCP Register tab fills in automatically; export or save on Report & Save.

New to it? Turn on Show worked example to see a filled register, then switch it off to build your own.

See a filled-in example supply, then switch off to enter your own. Show worked example

Supply details

Just enough to label your register.

Supply name or ID

Supply size

The numeric critical limits shown are the Level 3 monitoring-rule values.

Source water class

Sets the protozoa treatment target, which sets your filter turbidity limit (DWQAR rule 8 & T3.PC.2).

Treatment steps

Select every step your plant runs. Each control point becomes a CCP.

Your CCP register. Each card follows the standard structure:

Objective — what the control point achieves.
Monitoring — parameter, analyser, location, who is responsible, and records.
Performance criteria — target range, action limit and critical limit. Critical limits set by a rule are locked; the rest are editable.
Held-for duration — how long a limit must be exceeded before it applies, entered under each action and critical limit. Type a time (for example 2 min) or a proportion of run time (for example 5% of daily run time); the field suggests common values as you type.
Corrective actions — separate responses at the action and critical tiers.
Support systems — instrument and operational upkeep.

Everything you edit is saved and included in the report.

Export your register or save your work.

PDF report — a formatted, print-ready register.
CSV — the register as a spreadsheet.
Save (JSON) — downloads everything you've entered; load it back to continue.

Include in export

Select the sections to appear in the PDF and CSV.

Export

PDF and CSV of your CCP register.

Save & load

Save keeps everything in one JSON file on your device. Load restores it.

About this model

What a CCP is

A Critical Control Point (CCP) is a point or step in a process where control can be applied and a hazard prevented, eliminated, or reduced to an acceptable level. Each CCP has an objective, monitored parameters, performance criteria (target, action and critical limits), corrective actions and supporting systems.

Model basis

The CCP structure follows the WHO Water Safety Plan framework. In New Zealand the framework sits within a supply's Drinking Water Safety Plan. The DWQAR does not define "critical control point"; its defined term is barrier. This tool maps the DWQAR treatment rules onto the CCP structure, which is where the numeric critical limits and monitoring requirements live.

Performance criteria (three tiers)

Target range — normal operating envelope.
Action limit — the operator investigates and acts; typically the edge of the target range, with a short persistence duration.
Critical limit — the regulatory or validated limit, with a persistence duration; beyond it is a transgression / shutdown.

The critical limit is the anchor. Suggested target and action limits sit inside it by the margins set in Settings. Parameters can be one-sided (minimum or maximum) or a band with both a low and a high limit (for example pH or an operating FAC band).

Critical limit sources

Filter turbidity, direct filtration: T3.PD.3 / .6 (0.3 / 0.15 NTU by log credit).
Filter turbidity, coagulation + sedimentation/DAF + filtration: T3.PF.3 / .6 / .9 (0.3 / 0.15 / 0.1 NTU).
Protozoa target by source class: T3.PC.2 (A/B 0-log, C 3-log, D 4-log).
UV: validated RED / setpoint for the claimed credit, ≥95% of time T3.PU.4; monitoring UVT, turbidity, UVI/dose, flow T3.PU.2/.3; sensor referencing T3.PU; small-supply UV T2.10.
Chlorination C.t: ≥15 min.mg/L for ≥95% of time T3.BF.2.
Treated water leaving plant: turbidity and FACE T3.BC.4.
Cartridge filtration T2.8.

UV control approach

Two approaches are supported because they change what the CCP limit is set on:

Dose-pacing (calculated dose) — the reactor computes RED from measured UV intensity, flow and UVT and adjusts output automatically to hold the validated dose as flow and UVT vary. The primary critical limit is the calculated dose; UVT, flow and UVI are monitored inputs. Under this approach UVT is a validation input.
UV intensity setpoint — the reactor holds a validated UV intensity setpoint with flow within the certified range. UVT is monitored as an operational alarm and, under intensity-setpoint validation (for example ONORM/DVGW), is not itself a validation parameter.

UVT is monitored continuously in both cases; low UVT under dose-pacing drives higher output rather than an immediate under-dose, and alarms when the reactor can no longer maintain the validated dose.

Assumptions & limitations

Numeric critical limits shown are the Level 3 monitoring-rule values. Confirm what applies to your supply.
UV validated dose/setpoint, certified flow and validated UVT range are plant-specific — enter your validated values.
Membrane limits are flagged for confirmation against the applicable rules.
This is a register-building aid. It does not certify compliance and is not a substitute for a Drinking Water Safety Plan or Drinking Water Assessor sign-off.

References (public domain)

Water Services (Drinking Water Quality Assurance) Rules 2026 (in force 1 July 2027).
Water Services (Drinking Water Standards for New Zealand) Regulations 2022.
WHO Water Safety Plan framework.
USEPA Ultraviolet Disinfection Guidance Manual; USEPA LT2ESWTR.

Version 2.2