Since 1979-80, the San Antonio Spurs have the best defensive rating by a team in a season, with a 94.1 rating in 2003-04.

nba lowest team defensive rating in a season since 1980

TEAM	DRTG	SEASON	GP	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF
San Antonio Spurs	94.1	2003-04	82	240.9	91.5	45.1	20.4	8.1	6.5	14.7	34.7	78.5	44.2	5.0	13.9	35.8	17.2	25.2	68.1	19,755	7,501	3,698	1,676	661	537	1,203	1,667
San Antonio Spurs	95.0	1998-99	50	241.5	92.8	44.0	22.0	8.4	7.0	15.2	34.8	76.2	45.6	3.4	10.4	33.0	19.8	28.3	69.8	12,075	4,640	2,198	1,101	421	351	759	1,010
Detroit Pistons	95.4	2003-04	82	241.2	90.1	42.8	20.8	8.0	7.0	15.1	33.5	77.0	43.5	4.1	11.8	34.4	19.0	25.3	75.3	19,780	7,388	3,506	1,702	659	570	1,241	1,664
Atlanta Hawks	97.1	1998-99	50	241.5	86.3	43.5	15.6	6.9	5.2	14.9	30.8	75.2	40.9	3.9	12.9	30.6	20.8	28.4	73.1	12,075	4,315	2,175	782	346	260	745	987
Indiana Pacers	97.2	2003-04	82	241.5	91.4	41.7	21.6	8.9	5.0	14.4	33.6	77.1	43.5	5.5	15.6	35.1	18.8	24.6	76.4	19,805	7,493	3,417	1,774	726	411	1,182	1,709
Orlando Magic	97.4	1998-99	50	241.0	89.5	42.7	21.3	9.9	4.3	16.4	33.7	78.9	42.8	4.5	13.5	33.0	17.5	25.0	70.0	12,050	4,473	2,133	1,067	496	213	819	935
New York Knicks	97.5	1998-99	50	242.0	86.4	41.2	19.3	7.9	5.2	16.1	32.2	74.1	43.5	4.2	11.8	35.3	17.8	24.4	73.2	12,100	4,320	2,061	963	395	262	804	1,140
Philadelphia 76ers	97.6	1998-99	50	243.0	89.7	43.1	18.7	10.8	5.4	16.4	33.1	77.7	42.6	2.0	7.4	26.4	21.5	29.7	72.2	12,150	4,483	2,157	934	542	271	822	1,152
Portland Trail Blazers	97.7	1998-99	50	243.5	94.8	44.3	21.5	8.2	5.8	15.4	34.9	79.1	44.2	4.9	13.5	36.4	20.0	27.0	74.3	12,175	4,742	2,216	1,073	411	290	771	1,126
San Antonio Spurs	98.0	2000-01	82	241.8	96.2	44.1	21.7	6.9	7.0	14.0	35.2	76.4	46.1	5.4	13.3	40.7	20.4	28.5	71.5	19,830	7,886	3,614	1,778	568	576	1,145	1,551
Phoenix Suns	98.0	2000-01	82	241.5	94.0	42.7	23.2	9.5	5.2	15.2	35.9	82.4	43.6	4.0	12.9	31.5	18.2	24.1	75.5	19,805	7,710	3,499	1,905	775	429	1,250	1,864
New Jersey Nets	98.0	2003-04	82	240.3	90.3	40.7	24.5	8.6	3.9	14.7	34.3	77.7	44.1	4.6	13.7	33.6	17.0	22.6	75.3	19,705	7,401	3,335	2,009	709	322	1,209	1,722
New Jersey Nets	98.1	2002-03	82	240.9	95.4	42.9	23.0	8.7	4.6	14.8	35.4	80.3	44.1	4.2	12.7	33.2	20.3	26.8	75.7	19,755	7,820	3,519	1,887	717	374	1,212	1,772
New York Knicks	98.2	2000-01	82	242.7	88.7	40.2	18.5	6.6	4.2	14.5	33.6	75.6	44.4	4.8	13.6	35.1	16.8	21.1	79.6	19,905	7,275	3,297	1,520	545	346	1,189	1,863
New York Knicks	98.2	1993-94	82	240.9	98.5	45.3	25.2	9.2	4.7	16.6	37.8	82.1	46.0	3.9	11.1	34.8	19.1	25.6	74.6	19,755	8,076	3,717	2,067	752	385	1,360	2,001
Los Angeles Lakers	98.2	1999-00	82	241.5	100.8	47.0	23.4	7.5	6.5	13.9	38.3	83.4	45.9	4.2	12.8	32.9	20.1	28.9	69.6	19,805	8,267	3,855	1,921	613	534	1,143	1,841
Boston Celtics	98.2	2011-12	66	241.5	91.8	38.8	23.6	7.5	5.5	14.8	35.5	77.1	46.0	5.5	15.0	36.7	15.4	19.8	77.8	15,940	6,062	2,560	1,557	498	362	979	1,315
Chicago Bulls	98.3	2011-12	66	241.5	96.3	46.7	23.1	6.9	5.9	14.0	37.4	82.8	45.2	6.3	16.9	37.5	15.2	21.1	72.2	15,940	6,359	3,080	1,527	456	388	923	1,139
Utah Jazz	98.4	1998-99	50	243.5	93.3	41.3	24.1	8.0	5.5	16.3	33.7	72.4	46.5	2.8	7.8	36.1	23.2	30.2	76.7	12,175	4,666	2,063	1,204	398	276	814	1,133
Miami Heat	98.5	2000-01	82	242.4	88.9	39.6	19.9	7.7	3.7	13.7	32.9	76.3	43.0	5.8	16.9	34.5	17.4	22.9	75.9	19,880	7,289	3,248	1,630	633	304	1,122	1,726
San Antonio Spurs	98.6	1999-00	82	242.1	96.2	43.8	22.2	7.5	6.7	15.0	36.0	78.0	46.2	4.0	10.8	37.4	20.1	27.0	74.6	19,855	7,886	3,593	1,819	614	551	1,233	1,716
San Antonio Spurs	98.8	2004-05	82	241.5	96.2	42.4	21.6	7.5	6.6	13.7	35.6	78.7	45.3	6.2	17.0	36.3	18.7	25.9	72.4	19,805	7,888	3,476	1,771	613	543	1,126	1,717
Miami Heat	98.9	1998-99	50	240.5	89.0	40.3	20.4	6.5	6.1	14.9	32.3	71.3	45.3	5.8	16.1	35.9	18.6	25.2	73.5	12,025	4,449	2,015	1,019	327	304	744	1,035
Philadelphia 76ers	98.9	2000-01	82	242.1	94.7	44.8	20.6	8.4	5.0	15.8	35.4	79.1	44.7	3.2	9.8	32.6	20.7	27.8	74.5	19,855	7,763	3,675	1,692	690	408	1,292	1,673
Boston Celtics	98.9	2007-08	82	240.9	100.5	42.0	22.4	8.5	4.6	15.2	36.4	76.7	47.5	7.3	19.1	38.1	20.5	26.5	77.1	19,755	8,245	3,445	1,833	696	379	1,246	1,864