Biological river water quality league table: Macroinvertebrate Community Index (MCI), % of EPT taxa (mayflies, stoneflies and caddisflies), and periphyton
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State rankings for average MCI (2005-2007), average % of EPT taxa (2005–2007), and mean periphyton cover (1990–2006) at 66 sites in the national river water quality network (1=best, 66=worst) (ranks are based on standard scores)*
| River @ site Where there are two or more sites on the same river, sites from upstream to downstream are labelled (a), (b), etc. |
Region | Average MCI (2005–2007) | Average % of EPT (2005–2007) | Average % of EPT (2005–2007) | Annual maximum periphyton cover [%] (1990–2006) | Overall state ranking | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Hutt @ Kaitoke (A) | Wellington | 136.8 | (2) | 97.0 | (2) | 0 | (1=) | 1 | (2) | 1 |
| Ngaruroro @ Kuripapango (A) | Hawke's Bay | 142.8 | (1) | 65.8 | (24) | 0 | (1=) | 3 | (3) | 2 |
| Ruamahanga @ SH2 (A) | Wellington | 126.0 | (8) | 85.4 | (5) | 0 | (1=) | 4 | (4=) | 3 |
| Manganui @ SH3 (river joins Waitara upstream of Waitara @ Bertrand Rd) | Taranaki Region | 130.6 | (4) | 75.6 | (10) | 1 | (5=) | 4 | (4=) | 4 |
| Shotover @ Bowens Peak | Otago | 124.4 | (13) | 78.5 | (7) | 1 | (5=) | 8 | (9=) | 5 |
| Motueka @ Gorge (A) | Tasman | 128.1 | (5) | 72.5 | (16) | 1 | (5=) | 10 | (12=) | 6 |
| Mohaka @ Glenfalls (A) | Hawke's Bay | 120.4 | (15) | 73.4 | (15) | 0 | (1=) | 0 | (1) | 7 |
| Oreti @ Lumsden (A) | Southland | 125.4 | (9) | 70.9 | (19) | 1 | (5=) | 8 | (9=) | 8 |
| Wairau @ Dip Flat (A) | Marlborough | 118.7 | (17) | 77.5 | (8) | 1 | (5=) | 8 | (9=) | 9 |
| Buller @ Te Kuha (B) | West Coast | 133.3 | (3) | 74.0 | (13) | 6 | (26=) | 24 | (24=) | 10 |
| Kawarau @ Chards | Otago | 103.8 | (42) | 90.8 | (4) | 1 | (5=) | 6 | (8) | 11 |
| Mataura @ Parawa (A) | Southland | 118.1 | (19) | 70.9 | (20) | 2 | (13=) | 13 | (16) | 12 |
| Makaroro @ Burnt Br. (river joins Tukituki upstream of Tukituki @ Red Br.) | Hawke's Bay | 125.3 | (10) | 36.0 | (49) | 1 | (5=) | 5 | (7) | 13 |
| Waitaki @ Kurow (A) | Canterbury | 103.9 | (41) | 93.4 | (3) | 5 | (22=) | 10 | (12=) | 14 |
| Haast @ Roaring Billy | West Coast | 126.6 | (6) | 42.6 | (41) | 4 | (19=) | 16 | (18=) | 15 |
| Mohaka @ Raupunga (B) | Hawke's Bay | 114.7 | (23) | 55.1 | (31) | 3 | (18) | 10 | (12=) | 16 |
| Buller @ Longford (A) | Tasman | 117.3 | (20) | 66.5 | (23) | 4 | (19=) | 24 | (24=) | 17 |
| Waipapa @ Forest Ranger | Northland | 112.7 | (28) | 54.4 | (32) | 2 | (13=) | 14 | (17) | 18 |
| Waipa @ Otewa (A) | Waikato | 118.9 | (16) | 36.1 | (48) | 2 | (13=) | 10 | (12=) | 19 |
| Waikohu @ No. 1 Br. (river joins Waipoa upstream of Waipoa @ Kanakanaia) | Gisborne | 125.0 | (11) | 77.1 | (9) | 10 | (39=) | 38 | (44) | 20 |
| Waimakariri @ Gorge (A) | Canterbury | 102.7 | (45) | 74.8 | (12) | 2 | (13=) | 20 | (20=) | 21 |
| Tarawera @ Lake outlet (A) | Bay of Plenty | 100.0 | (51) | 98.6 | (1) | 7 | (28=) | 30 | (32) | 22 |
| Hurunui @ Mandamus (A) | Canterbury | 115.3 | (22) | 53.9 | (33) | 5 | (22=) | 35 | (37=) | 23 |
| Sutton @ SH87 (river joins Taieri between Taieri A and B) | Otago | 118.4 | (18) | 71.1 | (17) | 12 | (45=) | 36 | (39) | 24 |
| Waitaki @ SH1 Br. (B) | Canterbury | 94.4 | (59) | 47.9 | (37) | 1 | (5=) | 4 | (4=) | 25 |
| Ruamahanga @ Wardells (B) | Wellington | 113.9 | (26) | 63.5 | (25) | 8 | (34=) | 37 | (40=) | 26 |
| Rangitikei @ Kakariki (B) | Manawatu-Wanganui | 110.7 | (32) | 59.2 | (27) | 7 | (28=) | 31 | (33=) | 27 |
| Opihi @ Rockwood (A) | Canterbury | 108.1 | (37) | 69.5 | (22) | 7 | (28=) | 37 | (40=) | 28 |
| Motu @ Waitangirua (A) | Gisborne | 124.2 | (14) | 75.3 | (11) | 13 | (47) | 56 | (55) | 29 |
| Opihi @ Waipopo (B) | Canterbury | 111.3 | (30) | 70.5 | (21) | 10 | (39=) | 37 | (40=) | 30 |
| Taieri @ Tiroiti (A) | Otago | 107.3 | (38) | 79.0 | (6) | 12 | (45=) | 31 | (33=) | 31 |
| Grey @ Waipuna (A) | West Coast | 124.7 | (12) | 17.6 | (57) | 7 | (28=) | 27 | (29) | 32 |
| Waingongoro @ SH45 | Taranaki Region | 97.5 | (54) | 59.9 | (26) | 5 | (22=) | 20 | (20=) | 33 |
| Rangitikei @ Mangaweka (A) | Manawatu-Wanganui | 109.5 | (34) | 52.7 | (34) | 8 | (34=) | 29 | (31) | 34 |
| Waimakariri above old HW Br. (B) | Canterbury | 102.3 | (47) | 38.6 | (46) | 2 | (13=) | 21 | (22) | 35 |
| Ngaruroro @ Chesterhope (B) | Hawke's Bay | 102.7 | (46) | 39.7 | (44) | 4 | (19=) | 22 | (23) | 36 |
| Whirinaki @ Galatea (river joins Rangitaiki upstream of Rangitaiki A) | Bay of Plenty | 126.5 | (7) | 57.5 | (29) | 17 | (55=) | 51 | (49=) | 37 |
| Rangitaiki @ Murapara (A) | Bay of Plenty | 115.6 | (21) | 45.6 | (39) | 14 | (48=) | 37 | (40=) | 38 |
| Clutha @ Luggate Br. (A) | Otago | 109.0 | (35) | 24.6 | (53) | 7 | (28=) | 26 | (27=) | 39 |
| Grey @ Dobson (B) | West Coast | 111.0 | (31) | 39.7 | (45) | 11 | (42=) | 35 | (37=) | 40 |
| Whanganui @ Paetawa (B) | Manawatu-Wanganui | 102.9 | (43) | 10.7 | (61) | 5 | (22=) | 16 | (18=) | 41 |
| Motueka @ Woodstock (B) | Tasman | 111.6 | (29) | 56.0 | (30) | 11 | (42=) | 60 | (57) | 42 |
| Hakatakamea above MH Br. (river joins Waitaki downstream of Waitaki A) | Canterbury | 114.1 | (24) | 73.8 | (14) | 20 | (61) | 55 | (54) | 43 |
| Ruamahanga @ Waihenga (C) | Wellington | 97.7 | (53) | 32.1 | (50) | 6 | (26=) | 28 | (30) | 44 |
| Motu @ Houpoto (B) | Bay of Plenty | 113.3 | (27) | 58.0 | (28) | 16 | (53=) | 53 | (51=) | 45 |
| Oreti @ Riverton HW Br. (B) | Southland | 102.7 | (44) | 31.9 | (51) | 11 | (42=) | 40 | (45=) | 46 |
| Manawatu @ Weber Rd (A) | Manawatu-Wanganui | 105.8 | (39) | 49.8 | (35) | 16 | (53=) | 51 | (49=) | 47 |
| Waiau @ Tuatapere | Southland | 96.7 | (56) | 25.5 | (52) | 9 | (38) | 33 | (35=) | 48 |
| Manawatu @ Teachers Coll. (B) | Manawatu-Wanganui | 89.2 | (62) | 22.3 | (55) | 7 | (28=) | 26 | (27=) | 49 |
| Waitara @ Bertrand Rd | Taranaki Region | 108.3 | (36) | 37.2 | (47) | 17 | (55=) | 49 | (47) | 50 |
| Hurunui @ SH1 Br. (B) | Canterbury | 100.5 | (49) | 12.9 | (58) | 8 | (34=) | 40 | (45=) | 51 |
| Mataura @ Seaward Down (B) | Southland | 92.9 | (60) | 70.9 | (18) | 18 | (57=) | 53 | (51=) | 52 |
| Rangitaiki @ Te Teko (B) | Bay of Plenty | 75.6 | (66) | 40.0 | (43) | 8 | (34=) | 25 | (26) | 53 |
| Wairau @ Tuamarina (B) | Marlborough | 101.5 | (48) | 45.4 | (40) | 15 | (51=) | 64 | (61) | 54 |
| Taieri @ Outram (B) | Otago | 104.9 | (40) | 22.3 | (56) | 15 | (51=) | 57 | (56) | 55 |
| Tukituki @ Red Br. | Hawke's Bay | 100.2 | (50) | 47.6 | (38) | 19 | (60) | 62 | (58) | 56 |
| Waikato @ Hamilton Traffic Br. (B) | Waikato | 79.1 | (64) | 9.1 | (62) | 10 | (39=) | 33 | (35=) | 57 |
| Opuha @ Skipton Br. (river joins Opihi upstream of Opihi A) | Canterbury | 96.2 | (57) | 11.8 | (60) | 18 | (57=) | 50 | (48) | 58 |
| Waitangi @ Wakelins | Northland | 92.4 | (61) | 8.4 | (63) | 14 | (48=) | 63 | (59=) | 59 |
| Hutt @ Boulcott (B) | Wellington | 99.6 | (52) | 2.6 | (66) | 18 | (57=) | 66 | (62=) | 60 |
| Tongariro @ Turangi | Waikato | 109.8 | (33) | 23.5 | (54) | 33 | (63) | 66 | (62=) | 61 |
| Manawatu @ Opiki Br. (C) | Manawatu-Wanganui | 78.5 | (65) | 8.1 | (64) | 14 | (48=) | 54 | (53) | 62 |
| Whanganui @ Te Maire (A) | Manawatu-Wanganui | 114.0 | (25) | 49.4 | (36) | 43 | (66) | 78 | (65) | 63 |
| Clutha @ Millers Flat (B) | Otago | 95.3 | (58) | 3.2 | (65) | 27 | (62) | 63 | (59=) | 64 |
| Monowai below Gates (river joins Waiau upstream of Waiau @ Tuatapere) | Southland | 97.2 | (55) | 12.4 | (59) | 38 | (64) | 74 | (64) | 65 |
| Ohinemuri @ Karangahake | Waikato | 86.3 | (63) | 42.0 | (42) | 42 | (65) | 80 | (66) | 66 |
*Standard score = value - median / interquartile range
