Lake Wiritoa is a coastal dune lake on the south-western edge of Whanganui, set within five hectares of park-like grounds. It’s one of the district’s best freshwater swimming options — the lake has consistently low bacteria levels and is monitored weekly through summer by Horizons Regional Council. Beyond swimming, it’s popular for water skiing, boating, kayaking and fishing.
Practical Information
| Location | Lake Wiritoa Road, south-west Whanganui |
|---|---|
| Entry | Free |
| Swimming | Generally safe — monitored weekly 1 Nov–30 Apr by Horizons Regional Council |
| Blue-green algae | Check before swimming — blooms can make the lake unsafe temporarily |
| Activities | Swimming, water skiing, boating, canoeing, kayaking, fishing |
| Facilities | Toilets at car park, picnic areas, 5ha park-like grounds |
| Water quality | LAWA — Lake Wiritoa |
About Lake Wiritoa
Lake Wiritoa is a natural coastal dune lake formed behind the sandhills of Whanganui’s south-western coast. The lake sits within a reserve of park-like grounds — grassed areas, mature vegetation and picnic spots that make it a pleasant destination even outside the swimming season.
Water quality at Wiritoa is consistently good for a public swimming lake. Horizons Regional Council monitors it weekly from 1 November through to 30 April for E. coli bacteria and cyanobacteria (blue-green algae). Bacteria levels are very low under normal conditions and the lake is safe for swimming during monitoring periods — with one important exception: blue-green algae blooms can occur and make the water unsafe. Always check the LAWA website or Horizons Council alerts before swimming if there have been recent warm spells.
The lake is well-suited to a range of water activities. Water skiing and motorised boating operate on the lake, as do kayaks and canoes. Fishing for perch and other species is also popular. Toilets are available at the car park.
What Visitors Say
“A lovely local lake — calm, clean water and a nice grassy area to set up for the day. Great for young kids who want to swim without dealing with surf.” — LAWA swim site visitor
“A real gem for water skiing — one of the better spots in the region. The picnic areas are nice and it’s free, which makes it a great family day out.” — Google review
Where to Learn More
LAWA — Lake Wiritoa Swim Site has weekly water quality results and current swim suitability status.
Horizons Regional Council — Lake Wiritoa covers the monitoring programme and safety information.
Whanganui District Council — Lake Wiritoa has facilities and park information.
Frequently Asked Questions
Is Lake Wiritoa safe for swimming?
Generally yes — the lake has very low bacteria levels and is monitored weekly from 1 November to 30 April. The main exception is blue-green algae blooms, which can render the water unsafe. Always check the LAWA website for current status before swimming.
What is blue-green algae and why does it matter?
Blue-green algae (cyanobacteria) blooms can occur in warm, still conditions. The toxins they produce are harmful to people and animals — do not swim in or drink the water when a bloom is present. Horizons Regional Council posts alerts when blooms are detected.
Can I water ski at Lake Wiritoa?
Yes — water skiing and motorised boating operate on the lake. Check with Whanganui District Council for any current rules around boat use and speed zones.
Is there fishing at Lake Wiritoa?
Yes — the lake supports fishing, primarily for perch. Check current fishing regulations with Fish and Game.
What facilities are at Lake Wiritoa?
Toilets are available at the car park. The grounds include grassed picnic areas. There is no café or hire facility on-site.
How do I get to Lake Wiritoa?
The lake is on the south-western edge of Whanganui via Lake Wiritoa Road. Follow signs from Castlecliff or the main road south-west from the city.
Lake Wiritoa is one of Whanganui’s recommended swimming spots. See Swimming in Whanganui for the full guide to swim locations across the district. For ocean swimming, Castlecliff Beach is the nearest patrolled option.