The water quality of Otago's major rivers could be under
threat. Photo by Bill Campbell.
Proposed national ''bottom lines'' on water quality could
lead to large-scale degradation of Otago's rivers and lakes,
the Otago Regional Council says.
The National Policy Statement for Freshwater Management
amendments proposes to establish two compulsory standards -
one for ecosystem health and one for human health for
secondary contact recreation - with minimum acceptable states
for water quality, along with a framework for making
Council policy planning and resource management director
Fraser McRae said at a committee meeting this week that,
overall, the proposed amendments aligned with the council's
6A water plan and other water plan changes.
''The biggest issue is the numbers they have put in place for
better water quality.''
The concern was the nutrient standards would be set at levels
''well below'' the levels already experienced in Otago's
mostly pristine waterways, he said.
''The water quality in most of our major rivers is well and
truly within those limits.''
If imposed, the standards would ''lead to large-scale
degradation of water quality in Otago''. The aim of the
council's submission on the proposal would be to lobby for
stricter standards to be set to ensure council standards were
not vulnerable to pressure to operate under more lax national
''We want to retain the good quality water we have got.''
Cr Louise Croot said it was really important the council
maintained the gains it had made with water quality in the
region and did not go backwards.
Council chairman Stephen Woodhead said while there was debate
over the numbers, he did not believe there was any intent to
''scupper'' any council initiatives at a regional level.
There were also concerns about the implications of the new
monitoring regime proposed, as it could mean testing for
aspects of water quality such as temperature and nitrogen
toxicity, which the council did not need to do and which was
difficult and expensive.
''We need to make sure the Crown is aware a lot of extra
time, cost and work would be needed for no extra benefit.''
A working group of Cr Gretchen Robertson, Mr Woodhead and Mr
McRae was formed to finish a submission to the Ministry for
the Environment on the proposed amendments.
The discussiojn document with the proposed amendments said it
was not intended for water bodies to be degraded down to
''Councils must continue to meet the existing NPS-FM
[national policy statement freshwater management] requirement
to maintain or improve the overall water quality within a
Having national bottom lines for some key attributes relating
to human health and ecosystem health would assist councils
and communities by providing clarity on the minimum
acceptable states required, the document said.
''This is expected to reduce costs and litigation associated
with the preparation of regional plans.''
Modelling done for the document showed out of 110 monitored
lakes in New Zealand, 24 breached the proposed chlorophyll
bottom line, 26 breached proposed total nitrogen, 18 breached
proposed total phosphorus and fewer than 2.3% of lakes and
rivers breached the proposed E. coli bottom lines.
Six out of 68 monitored river sites and six out of 16
monitored lake sites breached the proposed cyanobacteria
bottom line standards.