✨ Freshwater Management Guidelines
NEW ZEALAND GAZETTE, No. 81 — 10 AUGUST 2017
| | %
exceedances
over 540
cfu/100ml | %
exceedances
over 260
cfu/100ml | Median
concentration
(cfu/100ml) | 95th
percentile of
E. coli/100 mL | Description of risk of Campylobacter
infection (based on
E. coli indicator) |
|---|-----------------------------|-----------------------------|---------------------------------|-----------------------------------|------------------------------------------------------------------------------------------------|
| A
(Blue) | <5% | <20% | ≤130 | ≤540 | For at least half the time, the estimated risk is < 1 in 1000 (0.1% risk)
The predicted average infection risk is 1% |
| B
(Green) | 5–10% | 20–30% | ≤130 | ≤1000 | For at least half the time, the estimated risk is < 1 in 1000 (0.1% risk)
The predicted average infection risk is 2% |
| C
(Yellow) | 10–20% | 20–34% | ≤130 | ≤1200 | For at least half the time, the estimated risk is < 1 in 1000 (0.1% risk)
The predicted average infection risk is 3% |
| D
(Orange) | 20–30% | >34% | >130 | >1200 | 20-30% of the time the estimated risk is ≥50 in 1000 (>5% risk)
The predicted average infection risk is >3% |
| E
(Red) | >30% | >50% | >260 | >1200 | For more than 30% of the time the estimated risk is ≥50 in 1000 (>5% risk)
The predicted average infection risk is >7%* |
- The predicted average infection risk is the overall average infection to swimmers based on a random exposure on a random day, ignoring any possibility of not swimming during high flows or when a surveillance advisory is in place (assuming that the E. coli concentration follows a lognormal distribution). Actual risk will generally be less if a person does not swim during high flows.
-
Attribute state should be determined by using a minimum of 60 samples over a maximum of 5 years, collected on a regular basis regardless of weather and flow conditions. However, where a sample has been missed due to adverse weather or error, attribute state may be determined using samples over a longer timeframe.
-
Attribute state must be determined by satisfying all numeric attribute states.
-
Replace the Cyanobacteria – Planktonic attribute table with:
| Value |
|---|
| Human health for recreation |
| Freshwater Body Type |
| Lakes and lake fed rivers |
| Attribute |
| Cyanobacteria - Planktonic |
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NZ Gazette 2017, No 81
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🏛️
National Policy Statement for Freshwater Management Amendment Order 2017
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🏛️ Governance & Central AdministrationFreshwater Management, National Policy Statement, Resource Management Act, Water Quality, Water Quantity, Amendment Order