All DWA snakes are on there for a reason. They have either caused fatalities or are capable of serious localised or systemic reactions. The very fact you're looking for one that won't do any damage if it bites suggests that you are expecting to get nailed, not a good mindset for venomous snakes. As Si suggested, a few of the Trimeresurus/Cryptelytrops species have no recorded fatalities, but there's a very good chance of losing fingers/thunmbs from necrosis following a bite. Buy yourself a decent sized Boiga dendrophila and let it chew on your hand for a bit, that'll show you what a non-DWA snake can do to you, then think if you want to have worse happen. I've experienced this first hand and would not recommend the experience. If you do a search, you'll find pictures of the bite, and this from a non DWA, rear-fanged snake. As a starter hot I would suggest one that's always arsey, not one that is docile one minute and trying to take your face off the next.
In terms of venom strength, it doesn't really matter what snake you get as you shouldn't ever, sheer crappy luck notwithstanding, get bitten. However, some snakes are fast, agile and bitey and as such do not make good starter snakes.
Get some mentoring, find someone near you, or, if your that keen, travel and get on a "hots" handling program, you just might find that you don't want to keep them after all.

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Why can't anyone call me "sir" without adding "will you please leave" ?

My Reptiles1.1.0 Corallus caninus option] 1.2.0 Boiga dendrophila dendrophila [option 0.1.0 Trimeresurus trigonocephalus 2.2.1 Morelia viridis (Aru, Wamena & Biak) 1.1.0 Viridovipera vogelli 1.1.0 Orthriopis taeinurus 0.1.0 Morelia amethystina 0.1.0 Hydrodynastes gigas 0.1.0 Boa constrictor imperator 0.1.0 Natrix natrix helvetica 1.0.0 Crotalus atrox 3.0.0 Furcifer pardalis (2 Ambilobe, 1 Nosy be)

Others0.1.0 cats 1.0.0 son (very expensive to keep)

I would suggest that Vipera ursinii, the Meadow Viper from southeastern Europe is the least dangerous DWA snake. This is a tiny viper which feeds on insects/inverts. However, its fangs are so small it may as well not have any, with a venom so weak it is barely effective against the bugs it eats.
Unfortunately, as a member of the Vipera genus, a DWA is needed to keep them.
Without doubt, the least venomous DWA snake.

No....Get a mentor...

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ofcourse, my bad

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R.I.P Steve Irwin and all other amazing Herpetologists

From what I've been told this species are difficult in captivity and well protected.... not a good choice in my opinion (not that my opinion is worth anything..)

As for envenomating bites the problem is everyone reacts to venom in a different way!

The way I react to say a Viper bite is likely to be different to the way you react if bittten, more venom, less venom, your body condition, the snakes body condition and so on.

I've spoken to people who say an adder bite is like a bee sting!!!!!

However the bee would have to be the size of a Crow in my view...

5 days in Hospital!!!!

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1.1 IJJ's
2.2 GTP's
1.1 Bredl's
1.0 Sonoran Sidewinder
1.1 Eyelash Pit Vipers
3.4 Nose Horned Viper
1.1 Mangrove Snakes
1.1 North Mexican Pines

Black Mamba all the way lol

Putting yourself in the running for a Darwin award then?

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Why can't anyone call me "sir" without adding "will you please leave" ?

My Reptiles1.1.0 Corallus caninus option] 1.2.0 Boiga dendrophila dendrophila [option 0.1.0 Trimeresurus trigonocephalus 2.2.1 Morelia viridis (Aru, Wamena & Biak) 1.1.0 Viridovipera vogelli 1.1.0 Orthriopis taeinurus 0.1.0 Morelia amethystina 0.1.0 Hydrodynastes gigas 0.1.0 Boa constrictor imperator 0.1.0 Natrix natrix helvetica 1.0.0 Crotalus atrox 3.0.0 Furcifer pardalis (2 Ambilobe, 1 Nosy be)

Others0.1.0 cats 1.0.0 son (very expensive to keep)

Cant anyone get on here and ask a simple question without being screamed at to 'get some experience', 'why do you want a venomous snake?', 'what experience do you have???'. This guy might have no intention of keeping venomous, its a pretty simple question, he may just be curious as to what species is least venomous. He doesnt have to have a DWA license to ask a question about venomous snakes.
I'd probably suggest that Rhabdophis subminatus, the red-necked keelback, may pose the least threat to humans.

EDIT- Just read through the post, realised he does want DWA, my bad! Sorry guys.

Original question was which DWA would be the most harmless. I would firmly stand by V. ursinii. Have a look at Tony Phelps' "Poisonous Snakes" book, which wouls support this.

Sorry, no, this species has caused human fatalities, alo.ng with the yamakagshi/tiger snake (Rhabdophis tigrinus)

R.tigrinus has caused fatalities, but please find me on recorded fatality caused by Rhabdophis subminiatus. There have been cases where severe bites have been recorded, hence the reason they are on the DWA license, but i am suggesting that they are one of the snakes listed that i beleive to pose the least threat to keepers, because, being a small rear-fanged snake, they would struggle to get a fatal dose of venom into you.