[1.12.2] Checking if block is water

I am currently using onItemUse() 

@Override
	public EnumActionResult onItemUse(EntityPlayer player, World worldIn, BlockPos pos, EnumHand hand,
			EnumFacing facing, float hitX, float hitY, float hitZ) {

		if (!worldIn.isRemote) {
			IBlockState block = worldIn.getBlockState(pos);

			// CHECK AND SEE IF THE PLAYER IS HOLDING A DUST IN THEIR OFF HAND
			System.out.println("Pan right clicked!");
			if (block == Blocks.WATER.getDefaultState() || block == Blocks.FLOWING_WATER.getDefaultState()
					|| block == Blocks.GRASS.getDefaultState()) {
				System.out.println("Used on water");
				if (RecipeHolder.getPanningRecipe(player.getHeldItemOffhand()).get(0) != ItemStack.EMPTY) {
					System.out.println("Recipe found!");
					ItemStack offHand = player.getHeldItemOffhand();
					List<ItemStack> recipe = RecipeHolder.getPanningRecipe(offHand);

					// The player has enough of the dust in their hand
					if (offHand.getCount() >= recipe.get(0).getCount()) {
						System.out.println("Recipe input confirmed!");
						offHand.shrink(recipe.get(0).getCount());

						for (int i = 1; i < recipe.size(); i++) {
							worldIn.spawnEntity(
									new EntityItem(worldIn, pos.getX(), pos.getY() + 1, pos.getZ(), recipe.get(i)));
						}

						return EnumActionResult.SUCCESS;
					}
				}
			}
		}

		return EnumActionResult.FAIL;

	}

Grass is in there so I could test the other functionality, and it works, but water does not work. I am assuming this is because you interact through water so it never detects the water block but what is behind it. So how would I check for water?

Thanks, James