It is highly soluble in water, in contrast to lead arsenate, which makes it more toxic.

[9] The Occupational Safety and Health Administration has set a permissible exposure limit at 0.01 mg/m3 over an eight-hour time-weighted average, while the National Institute for Occupational Safety and Health recommends a limit five times less (0.002 mg/m3).

11002), and is subject to strict reporting requirements by facilities which produce, store, or use it in significant quantities.

[13] Hydrated analogues of weilite are haidingerite (monohydrate) and pharmacolite (dihydrate), with the latter name reflecting arsenic-related toxicity.

Examples of more complex, hydrated Ca arsenates with some anions hydrogenated, are ferrarisite,[14] guérinite,[15] sainfeldite,[16] vladimirite,[17] and jeankempite.