Last updated October 2026
Lake Rotomā is the easternmost of the Rotorua lakes, about 40 kilometres north-east of Rotorua on State Highway 30. Its name means “lake of exceptionally clear water”, and it has the clearest water of all the Rotorua lakes.
RotoruaNZ notes that it is popular for swimming on hot summer days, along with boating, waterskiing, kayaking and trout fishing. Bay of Plenty Regional Council tests the water at Whangaroa, the reserve at the western end of the lake, every week over summer, and the site holds a Good LAWA long-term grade.
Swimming Facts
Before you swim: Tested weekly Oct–Mar by Bay of Plenty Regional Council. Stay out for 48 hours after heavy rain. Latest result on LAWA
Today at Lake Rotomā
Tuesday 27 OctoberWater quality track record
What the grades mean
Excellent and Good: rarely unsafe for swimming. Fair: usually fine, but avoid swimming after rain. Poor: often unsuitable, especially after rain, so check the latest result first.
Grades use LAWA’s method: the 95th percentile of routine E. coli results over the five summers from 2020/21 to 2024/25, with at least 50 tests (248 per 100 mL from 112 tests).
Practical Information
- Location
- Whangaroa reserve, on the left of State Highway 30 as you reach Lake Rotomā from Rotorua; Matahi Spit reserve at the eastern end
- Distance from Rotorua
- About 40 km by road, north-east along State Highway 30
- Water
- Freshwater lake, no tides; deep and very clear
- Water quality
- Good (LAWA long-term grade, summers 2020/21 to 2024/25)
- Testing
- Weekly from October to March by Bay of Plenty Regional Council, at Whangaroa
- Dogs
- Allowed on a leash at Matahi Spit reserve (Rotorua Lakes Council)
- Facilities nearby
- Whangaroa: all-weather boat ramp, jetty, toilets and grass parking. Matahi Spit: picnic area, barbecues, boat ramp and toilets
About Lake Rotomā
Lake Rotomā covers about 1,110 hectares and lies 316 metres above sea level. It is deep, with an average depth of 37 metres and a deepest point of 83 metres, and it has no surface outlet: water leaves through underground seepage.
The lake formed about 8,500 years ago, and its catchment of about 2,810 hectares is small for a lake of its size.
The water clarity is around 11 metres, the best of the Rotorua lakes. Phosphorus levels have crept up in recent years, and the lake is part of the Rotorua Te Arawa Lakes Programme. A sewerage scheme for the lakeside homes was one of the key actions in the lake’s action plan, to stop septic tank waste reaching the water.
Four buoys near the centre of the lake mark the site of a submerged Māori pā. LAWA notes a waterfront camping ground, with a petrol station and general store, near the Whangaroa reserve.
The clear water makes trout fishing harder than on the other lakes, and Eastern Fish and Game has released tiger trout, a brown and brook trout hybrid with distinctive stripes, alongside the rainbow trout.
On land, the Rotomā Bridle Track is a 1 kilometre walk of about 20 minutes each way that runs beside State Highway 30 from Manawahe Road to Whangaroa Bay, through native bush with large rimu and tawa trees.
Swimming and Water Quality at Lake Rotomā
Bay of Plenty Regional Council samples the lake at Whangaroa every week from October to March and sends the results to LAWA. The site has a Good LAWA long-term grade, based on 112 routine tests over the summers of 2020/21 to 2024/25.
Of 138 tests between October 2019 and March 2025, 95% were suitable for swimming. A Good grade means the water has rarely been found unsuitable for swimming, but it is a long-term record, not a guarantee for any given day.
Check the latest result on LAWA before you swim, and stay out of the water for at least 48 hours after heavy rain, when runoff can carry bacteria into the lake.
Blue-green algae (cyanobacteria) can bloom in any lake in warm, settled weather and is dangerous to people and especially to dogs, so check LAWA for algae alerts and stay out of water that looks green or scummy.
Lake Rotomā is a deep lake, so keep a close eye on children and less confident swimmers. The lake is busy with boats, jet skis and waterskiers in summer.
Under New Zealand’s maritime rules, vessels must keep to 5 knots within 200 metres of the shore, except in marked access lanes, so stay clear of the boat ramps and ski lanes, such as the water ski access lane at Matahi Spit.
Large events such as open water swims sometimes close part of the lake: the Bay of Plenty harbourmaster issues public notices beforehand.
Getting There and Facilities
Drive north-east from Rotorua on State Highway 30, past Lake Rotoiti and Lake Rotoehu. The Whangaroa reserve, where the water is tested, is on the left as you approach Lake Rotomā from Rotorua. It has an all-weather boat ramp, a jetty and toilets, with parking on the grass next to the entrance.
Matahi Spit, at the eastern end of the lake, is a Rotorua Lakes Council reserve with a picnic area, barbecues, a boat ramp and toilets.
The council notes that it is popular for waterskiing, kayaking, windsurfing, jet-skiing and swimming, and dogs are allowed as long as they are on a leash. Behind the reserve is a lagoon that is home to local wildlife.
Where to Learn More
LAWA and Bay of Plenty Regional Council: the latest “Can I Swim Here?” result, algae alerts and the long-term grade for Lake Rotomā at Whangaroa.
Rotorua Lakes Council: facilities and dog rules at the Matahi Spit reserve on Lake Rotomā.
RotoruaNZ: visitor guide to Lake Rotomā, with trout fishing tips and the Rotomā Bridle Track.
Frequently Asked Questions
Can you swim at Lake Rotomā?
Yes. RotoruaNZ describes the lake as popular for swimming on hot summer days, and the regional council tests the water at Whangaroa weekly over summer. Check the latest result on LAWA before you swim.
What is the water quality like at Lake Rotomā?
The Whangaroa testing site has a Good LAWA long-term grade, based on summers 2020/21 to 2024/25. Of 138 tests between October 2019 and March 2025, 95% were suitable for swimming.
How clear is Lake Rotomā?
Its water clarity of around 11 metres is the best of the Rotorua lakes. The name itself means “lake of exceptionally clear water”.
How deep is Lake Rotomā?
The lake has an average depth of 37 metres and is 83 metres at its deepest point.
Are dogs allowed at Lake Rotomā?
Rotorua Lakes Council allows dogs on a leash at Matahi Spit reserve. Check LAWA for algae alerts first, as blue-green algae is dangerous to dogs.
What facilities are at Lake Rotomā?
Whangaroa has a boat ramp, jetty, toilets and grass parking. Matahi Spit has a picnic area, barbecues, a boat ramp and toilets.
How far is Lake Rotomā from Rotorua?
About 40 kilometres north-east of Rotorua along State Highway 30, past Lake Rotoiti and Lake Rotoehu.
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