Status of Nutrient Requirements for NPDES-Permitted Facilities--Majors with Monitoring Requirements

Table 3. Number and Percent of Major Municipal Sewage Treatment Facilities with Nitrogen (N) and/or Phosphorus (P) Monitoring Requirements for Monitoring Only Purposes or for Compliance with an Effluent Limit

This table represents the total number of individual permitted WWTFs that have monitoring requirements for nitrogen only, phosphorus only, or have monitoring requirements for both pollutants. These data include all individual, non-stormwater NPDES permitted facilities with data in ICIS as of February 2016. (These data include EPA-issued permits and tribal permits. These data only include requirements with measuring units that are either mass-based or concentration-based. WWTFs are publicly-owned treatment works (POTWs) with the primary permit standard industrial classification ("SIC") code 4952, and where there is no SIC code, the Facility Type Indicator field is labeled "POTW.")

EPA Region	State	Universe of Majors	Nitrogen Only (Number)	Nitrogen Only (Percent)	Phosphorus Only (Number)	Phosphorus Only (Percent)	Both N and P (Number)	Both N and P (Percent)	Any (N or P or Both) (Number)	Any (N or P or Both) (Percent)
10	AK	20	1	5	0	0	0	0	1	5
4	AL	119	0	0	0	0	119	100	119	100
6	AR	78	6	8	9	12	51	65	66	85
9	AS⁽⁴⁾	2	0	0	0	0	0	0	0	0
9	AZ	48	0	0	0	0	43	90	43	90
9	CA	175	26	15	2	1	116	66	144	82
8	CO	91	26	29	3	3	5	5	34	37
1	CT⁽²⁾	64	0	0	42	66	2	3	44	69
3	DC	2	0	0	0	0	2	100	2	100
3	DE	8	1	13	0	0	4	50	5	63
4	FL⁽⁵⁾	94	3	3	8	9	35	37	46	49
4	GA	151	0	0	78	52	43	28	121	80
6	GM⁽⁴⁾	0	0	0	0	0	0	0	0	0
9	GU⁽⁴⁾	3	0	0	0	0	0	0	0	0
9	HI	2	0	0	0	0	2	100	2	100
7	IA^(3),(6)	96	2	2	5	5	51	53	58	60
10	ID	28	1	4	3	11	22	79	26	93
5	IL	214	27	13	20	9	149	70	196	92
5	IN	133	1	1	75	56	13	10	89	67
7	KS	45	0	0	0	0	45	100	45	100
4	KY	87	10	11	10	11	66	76	86	99
6	LA	105	0	0	1	1	12	11	13	12
1	MA	91	21	23	18	20	43	47	82	90
3	MD	47	0	0	0	0	47	100	47	100
1	ME	61	0	0	14	23	0	0	14	23
5	MI	105	0	0	20	19	0	0	20	19
5	MN	75	15	20	9	12	50	67	74	99
7	MO	123	3	2	1	1	30	24	34	28
9	MP⁽⁴⁾	2	0	0	0	0	0	0	0	0
4	MS	65	0	0	0	0	61	94	61	94
8	MT	21	1	5	0	0	20	95	21	100
4	NC⁽²⁾	147	24	16	0	0	106	72	130	88
8	ND⁽³⁾	16	0	0	0	0	8	50	8	50
7	NE	30	0	0	0	0	24	80	24	80
1	NH	36	6	17	15	42	2	6	23	64
2	NJ^(3),(7)	92	2	2	17	18	44	48	63	68
6	NM	22	1	5	1	5	1	5	3	14
9	NV	7	1	14	0	0	6	86	7	100
2	NY	211	83	39	8	4	90	43	181	86
5	OH	205	79	39	1	0	120	59	200	98
6	OK	69	2	3	0	0	1	1	3	4
10	OR	50	2	4	0	0	26	52	28	56
3	PA	291	12	4	8	3	196	67	216	74
2	PR⁽⁴⁾	33	5	15	0	0	0	0	5	15
1	RI	19	10	53	0	0	9	47	19	100
4	SC	98	18	18	3	3	56	57	77	79
8	SD	20	6	30	0	0	5	25	11	55
4	TN	107	2	2	0	0	83	78	85	79
6	TX⁽⁸⁾	489	7	1	9	2	6	1	22	4
8	UT	29	0	0	1	3	23	79	24	83
3	VA⁽²⁾	92	12	13	3	3	22	24	37	40
2	VI⁽⁴⁾	2	0	0	2	100	0	0	2	100
1	VT⁽³⁾	0	0	0	0	0	0	0	0	0
10	WA⁽³⁾	48	2	4	1	2	35	73	38	79
5	WI	86	0	0	69	80	17	20	86	100
3	WV	50	0	0	0	0	18	36	18	36
8	WY⁽³⁾	16	1	6	1	6	0	0	2	13
Total		4,420	419	9	457	10	1,929	44	2,805	63

Notes:
(1) Note that all permits with limits should also have corresponding monitoring requirements for each parameter that is limited to track compliance.
(2) These states have watershed-based permitting for multiple dischargers for nutrients. These permits/facilities may not be reflected in this table. (VA - approximately 112 WWTFs covered for N & P; NC - approximately 54 WWTF covered for N; and CT - approximately 79 facilities covered for N)
(3) IA, ND, VT, WA, and WY did not have primary SIC codes entered into the Permit Basic Info section of ICIS for most or all of their facilities. NJ has only entered SIC codes for 46 percent of its individual permittees in ICIS.
(4) The following territories and regions are included in these tables: American Samoa (AS), Gulf of Mexico (GM), Guam (GU), Northern Mariana Islands (MP), Puerto Rico (PR), and U.S. Virgin Islands (VI).
(5) Upon review, this state indicated that it uses other monitoring location codes in addition to the ones used for this analysis. [FL]
(6) Iowa is in the process of transitioning to a new NPDES database and is working to ensuring accurate transfer and migration of required data into the EPA ICIS-NPDES data system. This process is expected to be complete by summer 2017.
(7) This state noted that its data are batch-loaded into ICIS, and therefore there are some errors based on the state's records. [NJ]
(8) This state indicated that the data managed to capture 12 permits that are either for stormwater (MS4) or industrial facilities. [TX]

Status of Nutrient Requirements for NPDES-Permitted Facilities--Majors with Monitoring Requirements

National Pollutant Discharge Elimination System (NPDES)