Service Delivery
Green Drop Wastewater Risk Rating
The Green Drop cumulative risk rating is the early-warning indicator for wastewater works heading toward failure, pollution incidents and environmental non-compliance.
Why the Green Drop Risk Rating Matters
The Department of Water and Sanitation's Green Drop programme scores wastewater treatment works on a cumulative risk basis, flagging works in critical-risk territory before effluent failures cause environmental and reputational damage. For accounting officers, a rising risk rating is both a service-delivery and a compliance exposure under the Water Services Act and NEMA. AuditPro Core tracks each works against its Green Drop critical-risk threshold so deteriorating infrastructure is escalated before it becomes a regulatory or audit issue.
The Numbers
AuditPro Core renders this view from your tenant's live, tamper-evident records. The figures below are illustrative sample data.
Works assessed
14
Critical risk
5
of 14
Avg CRR
74%
Effluent compliant
41%
Cumulative risk ratio by works
Works risk detail
| Works | Load % | CRR % | Status |
|---|---|---|---|
| WWTW 1 | 118 | 92 | Critical |
| WWTW 2 | 104 | 81 | Critical |
| WWTW 3 | 88 | 66 | High |
Figures shown are illustrative sample data for demonstration. AuditPro Core renders these views from your own tenant's live, tamper-evident records.
Cumulative risk rating
The rating aggregates design capacity, operational performance, effluent quality and skills into a single risk score. A works can pass on individual measures yet still breach the cumulative threshold.
Critical-risk threshold
Crossing the critical-risk line means the works poses a high likelihood of effluent failure. It triggers regulatory attention and should drive urgent capital and operational intervention.
Effluent compliance
Effluent quality measures whether discharged water meets licence limits before it enters rivers. Sustained non-compliance is both an environmental offence and a service-delivery failure.
Capacity utilisation
Works operating above design capacity cannot treat to standard no matter how well run. Hydraulic overload is a leading driver of critical-risk ratings.
How AuditPro Core Bridges the Gap
- Threshold monitoring: each works is tracked against its critical-risk cut-off with breaches highlighted automatically.
- Exception workflow: works entering critical risk escalate into corrective-action and capital-planning queues.
- Continuous monitoring: risk-rating trends reveal deterioration well before the annual Green Drop assessment.
- Audit-ready export: the risk register exports as evidence supporting the wastewater service-delivery report.
Key Takeaways
- The cumulative rating can flag risk even when individual measures look acceptable.
- Crossing the critical-risk threshold is a regulatory and environmental exposure, not just a performance number.
- Hydraulic overload routinely pushes works into critical risk; capacity must be tracked alongside quality.
- Tracking risk trends gives management time to act before the formal Green Drop score lands.
See This on Your Own Data
AuditPro Core renders this dashboard from your tenant's live, tamper-evident records — every figure traceable to source.