This is a relatively long-lived lizard with low fecundity that faces few serious threats due to the habitat it prefers and a life history that does not include seasonal movements.

The majority of threat categories are thought to have no or negligible impacts on Northern Alligator Lizard populations in British Columbia.

The highest scored threat category is Invasive Non-native species which has an overall impact score of low. Threats from non-native species come from domestic and feral cats, dogs, and Common Wall Lizards (Podarcis muralis). None of these threats are well documented and are based on anecdotal observations. Cats and dogs are both known to prey on Northern Alligator Lizards (D. Fraser, pers. obs.). Common Wall Lizards are suspected of competing with Northern Alligator Lizards for both food and hiding places. Neonate Alligator Lizards are likely eaten by adult Common Wall Lizards. On southern Vancouver Island, where Common Wall Lizards have been established the longest (Engelstoft et al. 2020), anecdotal declines in Alligator Lizards numbers have been suspected but not quantified (D. Fraser, pers. obs; K. Ovaska, pers. obs). Common Wall Lizards have rapidly expanded since they were introduced in 1970 (Bertram 1984) and are expected to continue to do so; as of January 2025 the range extent of Common Wall Lizard in British Columbia using a minimum convex polygon is 26,584 square km. and overlaps with Alligator Lizards. Bertram (1984) identified three study sites that were "unlikely to be colonized" by Wall Lizards on southern Vancouver Island--all of these sites are now occupied by Wall Lizards (D. Fraser, pers. obs.; iNaturalist records). Currently, Wall Lizards are known from Vancouver Island (mostly on the east side of the island from Victoria to Campbell River with some isolated occurrences on the west coast of the island), some of the Gulf Islands (Denman, Hornby, Newcastle, Thetis, Salt Spring, D?Arcy, Sidney and North Pender Islands), the Sunshine Coast, and the Lower Mainland (Richmond, Langely and Chilliwack) (Engelstoft et al 2020, iNaturalist records accessed Dec 2023). There are records of individuals from the Okanagan but these are not known to be established populations. The impact of this threat may increase if the population of Wall Lizards continues to expand at the current rate.

In addition to the threats from vertebrate species, several captive Alligator Lizards died after eating caterpillars of the Cinnabar Moth (Tyria jacobaeae), an introduced pest control agent for controlling poisonous Tansy Ragweed, and there is a possibility that this exotic moth may have adverse effects on Northern Alligator Lizard populations (Nussbaum et al. 1983).

Several potential threats have unknown impact and require more research.

Problematic native species: Anecdotal observations suggest that some avian predators (American Crows, American Kestrels, Northern Pygmy Owls, Great Blue Herons, American Robins, Barred Owls) have increased their reliance on lizards as prey items with the abundance of Common Wall Lizards in habitats along the east side of Vancouver Island. This may increase predation on Northern Alligator Lizards as they are slower and less nimble than Wall Lizards at moderate temperatures (Bertram 2004) and may be easier to catch. Northern Alligator Lizards are thought to be the primary host for the tick, Ixodes pacificus, and heavy tick loads have been recorded on some Northern Alligator Lizards in California (Nieto et al 2009) and the ticks can carry Anaplasma phagocytophilum, a bacterial disease. The impact of the ticks and the bacterial disease on the lizard are not well understood.

Impacts of wildfires are also an unknown but