The Los Angeles Kings have the worst penalty-kill percentage by a team in a season, at 68.2 percent in 1979-80.

worst penalty kill percentage in nhl history by a team in a single season

TEAM	PK%	SEASON	GP	W	L	T	OTL	PTS	PTS%	G	GA	PP%	S/GP	SA/GP
Los Angeles Kings	68.2	1979-80	80	30	36	14		74	.463	290	313	26.8	28.96	30.70
Los Angeles Kings	68.6	1982-83	80	27	41	12		66	.413	308	365	24.3	33.46	30.59
Washington Capitals	69.7	1978-79	80	24	41	15		63	.394	273	338	18.9	28.48	31.65
Vancouver Canucks	70.5	1984-85	80	25	46	9		59	.369	284	401	19.5	31.16	33.26
Colorado Rockies	70.6	1978-79	80	15	53	12		42	.263	210	331	22.5	27.34	30.96
New Jersey Devils	70.9	2020-21	56	19	30		7	45	.402	145	189	14.2	28.79	31.02
Detroit Red Wings	71.0	1985-86	80	17	57	6		40	.250	266	415	20.9	28.50	32.85
Washington Capitals	71.4	1977-78	80	17	49	14		48	.300	195	321	12.5	24.95	31.25
Vancouver Canucks	71.5	1977-78	80	20	43	17		57	.356	239	320	22.5	25.65	30.78
New York Islanders	71.5	2023-24	82	39	27		16	94	.573	245	258	20.3	30.12	32.76
Vancouver Canucks	71.6	2022-23	82	38	37		7	83	.506	270	296	22.7	29.73	30.83
Minnesota North Stars	71.6	1977-78	80	18	53	9		45	.281	218	325	14.9	28.81	31.50
Los Angeles Kings	71.7	1981-82	80	24	41	15		63	.394	314	369	21.2	32.01	30.59
Los Angeles Kings	71.9	1985-86	80	23	49	8		54	.338	284	389	17.5	30.30	32.63
Los Angeles Kings	72.1	1983-84	80	23	44	13		59	.369	309	376	20.8	30.89	31.69
Anaheim Ducks	72.1	2022-23	82	23	47		12	58	.354	206	335	15.7	28.37	39.11
Hartford Whalers	72.1	1981-82	80	21	41	18		60	.375	264	351	23.1	31.10	34.06
St. Louis Blues	72.4	2022-23	82	37	38		7	81	.494	260	298	19.3	28.55	32.34
Anaheim Ducks	72.4	2023-24	82	27	50		5	59	.360	203	293	18.3	26.76	32.51
Pittsburgh Penguins	72.5	1982-83	80	18	53	9		45	.281	257	394	22.5	30.23	32.69
Detroit Red Wings	72.6	1982-83	80	21	44	15		57	.356	263	344	13.8	29.64	28.95
Toronto Maple Leafs	72.7	1988-89	80	28	46	6		62	.388	259	342	16.7	27.06	34.29
Montreal Canadiens	72.7	2022-23	82	31	45		6	68	.415	227	305	16.1	27.28	33.57
Chicago Blackhawks	72.7	2018-19	82	36	34		12	84	.512	267	291	20.2	32.55	34.78
Toronto Maple Leafs	73.0	1981-82	80	20	44	16		56	.350	298	380	20.3	29.10	34.71