(a) Whenever any tenement, lodging or boarding house or any building, structure, excavation, business pursuit, matter or thing in or about such house or the lot on which it is situated, or the plumbing, sewerage, drainage, lighting, paint or ventilation of such house, is, in the opinion of the board of health or other enforcing agency, in a condition which is or in its effect is dangerous or detrimental to life or health, or whenever any tenement, lodging or boarding house in the opinion of the board or enforcing agency, is in violation of the provisions of section 19a-109 , the board or other enforcing agency may declare that the same, to the extent specified by the board or other enforcing agency, is a public nuisance. The board or enforcing agency may order such public nuisance to be removed, abated, suspended, altered or otherwise remedied, improved or purified. The board of health or other enforcing agency may also order or cause any tenement house or part thereof, or any excavation, building, structure, sewer, plumbing pipe, paint, passage, premises, ground, matter or thing in or about a tenement, lodging or boarding house or the lot on which such house is situated, to be purified, cleansed, disinfected, removed, altered, repaired or improved. If the board or enforcing agency issues an order to a registrant, such order may be delivered in accordance with section 7-148ii , provided nothing in this section shall preclude a board or enforcing agency from providing notice in another manner permitted by applicable law.