Lizards
Asian water monitor care guide
Varanus salvator
A giant (6–8 ft), intelligent monitor. Expert-only: needs a room-sized enclosure with a pool.
Semi-arboreal — floor space plus climbing
New to reptiles? Check your keeper level first →Asian water monitor enclosure size
Semi-arboreal — floor space plus climbing. An adult asian water monitor should live in at least 144" L × 72" W × 72" H; we build toward 192" L × 96" W × 96" H (16 × 8 × 8 ft, roughly 128 sq ft of floor and about a 7660-gallon glass equivalent).
- Hatchling / baby
- 48" L × 24" W × 24" H recommended · min 36" L × 18" W × 18" H
- Juvenile
- 96" L × 48" W × 48" H recommended · min 72" L × 36" W × 36" H
- Adult
- 192" L × 96" W × 96" H recommended · min 144" L × 72" W × 72" H
Temperature and heating
Overhead heat (halogen, deep heat projector or radiant panel) on a thermostat, creating a warm-to-cool gradient.
- Basking / warm surface
- 120–130°F basking surface
- Warm side (ambient)
- 90–95°F
- Cool side (ambient)
- 78–82°F
- Night
- No lower than 75°F
Lighting and UVB
UVB: Strong UVB required (T5 HO 10–12% across most of the enclosure). Run lights on a 12 hours on, 12 hours off photoperiod, on a timer, and replace UVB bulbs on the manufacturer's schedule even while they still emit visible light.
Humidity
Target 60–80%. Large soaking pool and deep moist substrate.
Substrate and depth
Soil/cypress mix that holds burrows. Depth: 12+ in.
Diet and feeding
Whole prey: rodents, fish, eggs, insects; avoid fatty dog/cat food.
Enclosure tips and furnishing
- Hides on both the warm and cool sides
- Clean water available at all times
- Branches and foliage for climbing and cover
Build list
- Enclosure at adult size — Buy for the adult footprint to avoid repeated upgrades.
- Digital thermostat — Every heat source must run through a thermostat — unregulated heat burns animals.
- Two digital probe thermometers + hygrometer — Read the warm side, cool side and humidity directly.
Asian water monitor FAQ
How big should an adult Asian water monitor enclosure be?
At least 144" L × 72" W × 72" H, and we recommend building to 192" L × 96" W × 96" H — about 16 × 8 × 8 ft, or a 7660-gallon glass equivalent. Semi-arboreal — floor space plus climbing.
What temperatures does an Asian water monitor need?
Basking or warm surface 120–130°F basking surface, warm side 90–95°F, cool side 78–82°F, night No lower than 75°F. Overhead heat (halogen, deep heat projector or radiant panel) on a thermostat, creating a warm-to-cool gradient.
Does an Asian water monitor need UVB?
Strong UVB required (T5 HO 10–12% across most of the enclosure). Photoperiod: 12 hours on, 12 hours off.
What humidity does an Asian water monitor need?
60–80%. Large soaking pool and deep moist substrate.
What substrate is best for an Asian water monitor?
Soil/cypress mix that holds burrows, at a depth of 12+ in.
How big does an Asian water monitor enclosure need to be for a hatchling?
Hatchling / baby: 48" L × 24" W × 24" H recommended, minimum 36" L × 18" W × 18" H. Scale up to the adult footprint as the animal grows.
Is there anything to be careful about when keeping an Asian water monitor?
Giant lizard. Check local laws — some areas restrict large monitors. Bites and tail whips can cause serious injury.
Sources
Put this guide to work
Apply these targets to your own asian water monitor record, then log feedings, sheds and weights against them.