Freshwater E. coli Monitoring

Microbiological Assessment Category (MAC) Grades

Map

Scroll/zoom on the map to find areas of interest. Click on a coloured site to see more information. Use the toggle in the top right to compare all weather vs dry weather. Arrows next to the MAC grade in the label/popup indicate change from last season.

Table

Area Site Flows 95th % of E. coli MAC Samples this year Total samples
Kapiti Otaki River at State Highway One all 332 C 13 47
Kapiti Otaki River at State Highway One dry 228 B ↑ 13 40
Kapiti Waikanae River at Jim Cooke Park all 500 C ↑ 15 49
Kapiti Waikanae River at Jim Cooke Park dry 448 C 15 40
Kapiti Waikanae River at State Highway One all 435 C ↑ 15 49
Kapiti Waikanae River at State Highway One dry 380 C ↑ 15 40
Hutt Akatarawa River at Hutt Confluence all 508 C 8 42
Hutt Akatarawa River at Hutt Confluence dry 471 C 8 33
Hutt Hutt River at Birchville all 587 D ↓ 9 43
Hutt Hutt River at Birchville dry 520 C ↓ 9 40
Hutt Hutt River at Maoribank Corner all 814 D 9 43
Hutt Hutt River at Maoribank Corner dry 800 D 9 36
Hutt Hutt River at Melling Bridge all 935 D 9 43
Hutt Hutt River at Melling Bridge dry 965 D 9 37
Hutt Hutt River at Poets Park all 716 D 9 43
Hutt Hutt River at Poets Park dry 642 D 9 36
Hutt Hutt River Upstream of Silverstream Bridge all 790 D 9 43
Hutt Hutt River Upstream of Silverstream Bridge dry 840 D 9 38
Hutt Pakuratahi River at Hutt Forks all 609 D 9 43
Hutt Pakuratahi River at Hutt Forks dry 679 D 8 33
Hutt Wainuiomata River at Richard Prouse Park all 1094 D 9 43
Hutt Wainuiomata River at Richard Prouse Park dry 1182 D 9 39
Wairarapa Ruamahanga River at Double Bridges all 292 C ↓ 7 41
Wairarapa Ruamahanga River at Double Bridges dry 170 B ↓ 7 23
Wairarapa Ruamahanga River at Kokotau all 348 C ↓ 7 42
Wairarapa Ruamahanga River at Kokotau dry 473 C ↓ 7 34
Wairarapa Ruamahanga River at Morrisons Bush all 536 C ↓ 7 42
Wairarapa Ruamahanga River at Morrisons Bush dry 621 D ↓ ↓ 7 37
Wairarapa Ruamahanga River at Te Ore Ore all 1290 D 7 41
Wairarapa Ruamahanga River at Te Ore Ore dry 852 D ↓ 7 23
Wairarapa Ruamahanga River at The Cliffs all 170 B 7 42
Wairarapa Ruamahanga River at The Cliffs dry 185 B 7 34
Wairarapa Ruamahanga River at Waihenga Bridge all 536 C ↓ 7 42
Wairarapa Ruamahanga River at Waihenga Bridge dry 194 B 6 40
Wairarapa Waingawa River at South Road all 126 A 7 42
Wairarapa Waingawa River at South Road dry 94 A 7 33
Wairarapa Waiohine River at State Highway 2 all 215 B ↓ 7 42
Wairarapa Waiohine River at State Highway 2 dry 48 A 7 32
Wairarapa Waipoua River at Colombo Road all 238 B 7 42
Wairarapa Waipoua River at Colombo Road dry 173 B 6 34


Summary of action guideline breaches for E. coli

Use the tabs below to see action guideline breaches for E. coli (>550 cfu/100mL) from routine surveillance monitoring. Detailed Whaitua tables list preceding rainfall (mm) and the number of follow up samples required before compliance with the surveillance guideline was met.

Overall

No. of times site breached the action guideline Kapiti (3) Hutt & Wainuiomata (8) Wairarapa (9) Total no. of sites (20) % of sites
0 2 3 5 10 50.0
1 1 4 4 9 45.0
2 0 1 0 1 5.0

Kāpiti

Date Site name E. coli count (cfu/100mL) Rainfall station Rainfall (mm) 00-24h Rainfall (mm) 25-48h Rainfall (mm) 49-72h # follow up samples
2018-12-03 Waikanae River at Jim Cooke Park 1,160 Waikanae River at Water Treatment Plant 14 11 1.5 2

Hutt

Date Site name E. coli count (cfu/100mL) Rainfall station Rainfall (mm) 00-24h Rainfall (mm) 25-48h Rainfall (mm) 49-72h # follow up samples
2019-01-13 Hutt River at Birchville 800 Hutt River at Te Marua 16.8 0.2 0.8 0
2019-01-13 Hutt River at Maoribank Corner 800 Hutt River at Te Marua 16.8 0.2 0.8 0
2019-01-13 Hutt River at Melling Bridge 1,000 Hutt River at Te Marua 16.8 0.0 1.0 0
2019-01-13 Hutt River at Poets Park 600 Hutt River at Te Marua 16.8 0.0 1.0 0
2019-01-14 Wainuiomata River at Richard Prouse Park 2,400 Wainuiomata River at Wainui Reservoir 24.4 0.0 0.6 0
2019-02-24 Hutt River at Birchville 600 Hutt River at Te Marua 22.8 6.0 28.6 0

Wairarapa

Date Site name E. coli count (cfu/100mL) Rainfall station Rainfall (mm) 00-24h Rainfall (mm) 25-48h Rainfall (mm) 49-72h # follow up samples
2018-12-03 Ruamahanga River at Kokotau 2,400 Waingawa River at Angle Knob 19.5 50 22.5 0
2018-12-03 Ruamahanga River at Morrisons Bush 4,000 Waiohine River at Gorge 6.5 77 5.5 0
2018-12-03 Ruamahanga River at Waihenga Bridge 5,200 Waingawa River at Angle Knob 28.5 50 22.5 0
2019-02-12 Ruamahanga River at Te Ore Ore 660 Ruamahanga River at Mt Bruce 0.0 0 0.0 0