Louisiana Water Quality — 309 Cities Tested

Latest water news in Louisiana

Recent reporting on Louisiana drinking water — boil-water advisories, regulatory action, and infrastructure events.

May 20, 2026

Louisiana's 2026 Water Report Card: 58 Public Systems Fail, Including Shreveport

Louisiana graded 909 public water systems for 2026 — 67% earned an A, but 58 failed, led by Shreveport and arsenic violations in Rayville.

Read full story →

Analysis

Louisiana water quality overview

Louisiana's drinking water quality is fair overall, with an average score of 65.5 out of 100 across 309 cities tested. The median score is 69, serving a total population of 5,158,407 residents. 38% of cities scored a D or F, pointing to significant water quality challenges in parts of the state. PFAS "forever chemicals" were detected in 141 of 309 cities tested (46%). 6 cities exceed the 2024 EPA maximum contaminant levels. 1 city has lead levels exceeding the EPA action level of 15 ppb, often indicating aging infrastructure with lead service lines or lead solder. The state relies on a mix of water sources: 270 cities use groundwater while 39 draw from surface water such as rivers, lakes, and reservoirs.

Key Concerns

Issues to watch in Louisiana

141 cities

PFAS Detected

46% of tested cities have PFAS in their water supply.

1 cities

Lead Exceedances

Lead levels above the EPA action level of 15 ppb (90th percentile).

303 cities

Health Violations

22,059 total violations recorded, 308 with unresolved issues.

62 cities

Failing Systems

Received a grade of F, indicating serious water quality issues.

Contaminant Data

Explore contaminants in Louisiana

Lead in Louisiana → Ranked by 90th percentile level (ppb) PFAS in Louisiana → Ranked by compounds detected Copper in Louisiana → Ranked by 90th percentile level (mg/L)

More contaminants tested in Louisiana

HAA5 → Chromium-6 → Arsenic → Nitrate → Strontium → 1,4-Dioxane → Manganese → Vanadium → Chlorate → Molybdenum → Cobalt → Lithium → NDMA → Perchlorate →

State context

17

Superfund sites in Louisiana

EPA National Priorities List

38.0%

of Louisiana residents on fluoridated water

CDC, 2020

8,651,319

lbs released to surface water

Top 10 TRI facilities, 2023

5.8%

of Louisiana domestic wells exceed EPA arsenic limit

USGS, 2,263 samples · 10 µg/L MCL

Domestic well chemistry

Private-well water in Louisiana

Based on USGS Powell Domestic-Well Database — 3,626 private wells sampled across Louisiana. These wells are not regulated by the EPA; if you draw your tap from a private well, the public-system grade above does not apply to you.

1.0 µg/L

Median arsenic in domestic wells

P90 6.3 µg/L · max 67.7 µg/L

168 µg/L

Median manganese in domestic wells

37.9% exceed 300 µg/L aesthetic limit

Industrial pollution

Top industrial water polluters in Louisiana

Industrial polluters nearby

The 10 facilities reporting the most pounds released to surface water in Louisiana, 2023.

Total reported releases to surface water: 8,651,319 lbs

Facility	Top chemical	To surface water (lbs/yr)
CF INDUSTRIES NITROGEN LLC Chemicals · CF INDUSTRIES HOLDINGS INC DONALDSONVILLE, LA70346	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	1,514,677
SYNGENTA CROP PROTECTION LLC SAINT GABRIEL FACILITY Chemicals · SYNGENTA CORP SAINT GABRIEL, LA70776	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	1,197,246
BASF CORP Chemicals · BASF CORP GEISMAR, LA70734	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	1,113,061
FOSTER FARMS FARMERVILLE PLANT Food · FOSTER FARMS LLC FARMERVILLE, LA71241	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	1,071,606
CITGO PETROLEUM CORP Petroleum · PDV HOLDING INC SULPHUR, LA70665	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	996,256

+ 5 more facilities

Source: EPA Toxic Release Inventory (TRI) 2023

Test your own tap

Get your Louisiana water tested

City-level data shows the source and infrastructure picture — but lead and other home-plumbing issues only show up at your tap. Find a state-certified lab, see what to test for, and what it costs.

Grade Distribution

How Louisiana cities scored

A: 72 B: 79 C: 40 D: 56 F: 62

Best Cities

Worst Cities

City Map

Water quality across Louisiana

Each dot is a city, colored by its water quality grade. Size reflects population served. Click any city to view its full water report.

All Cities

309 cities in Louisiana

Full rankings →

#	City	Grade	Score	Population	Violations
1	Dequincy	A+	97.1	5K	5
2	Singer	A+	96	7K	15
3	Lockport	A+	95.3	82K	4
4	Forest Hill	A	94.1	4K	7
5	Ethel	A	94	15K	16
6	Deville	A	92.8	12K	4
7	Erath	A	92.8	3K	15
8	Barksdale Afb	A	92.7	13K	22
9	Hackberry	A	92.5	926	24
10	Pearl River	A	92.2	4K	11
11	Johnson Bayou	A	91.4	2K	3
12	Hineston	A	91.1	1K	28
13	Natchez	A	91	8K	28
14	Summerfield	A	91	1K	6
15	Abita Springs	A	90.8	4K	13
16	Natchitoches	A	90.7	28K	24
17	Pelican	A	90.6	1K	10
18	Forest	A	90.4	2K	5
19	Turkey Creek	A	90.2	5K	9
20	Pitkin	A	90.2	750	13
21	Kelly	A	90.1	1K	8
22	Angola	A	90	6K	12
23	Oak Ridge	A-	89.9	714	16
24	Reeves	A-	89.6	4K	20
25	Folsom	A-	89.6	2K	11
26	Morganza	A-	89.5	1K	4
27	Plaucheville	A-	89.2	4K	7
28	Archibald	A-	89.1	4K	16
29	Thibodaux	A-	89	15K	39
30	Luling	A-	88.9	53K	3
31	Simpson	A-	88.9	1K	8
32	Innis	A-	88.8	2K	7
33	Starks	A-	88.7	3K	18
34	St. Landry	A-	88.7	711	15
35	Welsh	A-	88.5	10K	11
36	Bordelonville	A-	88.5	4K	5
37	Tioga	A-	88.4	20K	11
38	Urania	A-	88.4	784	14
39	Athens	A-	88.3	5K	45
40	Evergreen	A-	88.2	2K	12
41	Slagle	A-	88	6K	1
42	Maringouin	A-	87.9	3K	13
43	Chalmette	A-	87.7	45K	47
44	Gonzales	A-	87.7	17K	30
45	Stonewall	A-	87.7	8K	12
46	Woodworth	A-	87.5	5K	17
47	Vivian	A-	87.3	4K	21
48	Effie	A-	87.2	4K	9
49	Tickfaw	A-	87.2	764	10
50	Carencro	A-	86.8	11K	18
51	Elmer	A-	86.8	3K	7
52	Livonia	A-	86.7	1K	1
53	Hornbeck	A-	86.6	3K	2
54	Longville	A-	86.5	24K	15
55	Mansura	A-	86.5	3K	3
56	Basile	A-	86.3	7K	42
57	Mer Rouge	A-	86.3	3K	19
58	Gretna	A-	86.2	17K	24
59	Walker	A-	86.2	16K	17
60	Baker	A-	86.2	14K	15
61	Bethany	A-	86.2	2K	12
62	Elizabeth	A-	86.2	966	4
63	Fort Johnson	A-	86	22K	23
64	Jefferson	A-	85.8	415K	5
65	Grant	A-	85.7	2K	14
66	Start	A-	85.5	3K	6
67	Lawtell	A-	85.3	10K	21
68	Elton	A-	85.3	2K	30
69	Napoleonville	A-	85	21K	33
70	Lake Arthur	A-	85	12K	16
71	Bently	A-	85	5K	6
72	Slaughter	A-	85	2K	8
73	Clinton	B+	83.9	3K	15
74	St. Francisville	B+	83.8	14K	19
75	Carville	B+	83.8	600	9
76	Sulphur	B+	83.5	46K	44
77	Mangham	B+	83.4	927	11
78	Blanchard	B+	83.2	16K	52
79	Deridder	B+	83.2	14K	8
80	Dubberly	B+	83.2	2K	12
81	Washington	B+	83.1	2K	16
82	Iowa	B+	83	4K	15
83	Port Barre	B+	82.8	7K	55
84	Hall Summit	B+	82.8	756	14
85	Livingston	B+	82.7	13K	37
86	Morrow	B+	82.7	2K	1
87	Lena	B+	82.5	4K	10
88	Houma	B+	82.4	128K	19
89	Vinton	B+	82.3	5K	9
90	Lutcher	B+	82.3	5K	25
91	Pioneer	B+	82.3	2K	8
92	Boyce	B+	82	11K	45
93	Charenton	B+	82	10K	17
94	Cankton	B+	81.9	3K	20
95	Echo	B+	81.8	1K	14
96	Krotz Springs	B+	81.5	3K	21
97	Anacoco	B+	81.3	6K	14
98	Abbeville	B+	81.2	30K	23
99	Convent	B+	80.8	15K	71
100	Bell City	B+	80.8	5K	17
101	Jennings	B+	80.7	14K	16
102	Jackson	B+	80.4	7K	78
103	Berwick	B+	80.2	6K	20
104	Hosston	B+	80.2	729	61
105	Delhi	B+	80	8K	66
106	Merryville	B	79.7	3K	24
107	Ruston	B	79.5	35K	49
108	Shongaloo	B	79.5	2K	24
109	Springhill	B	79.3	8K	12
110	Crowville	B	79.2	8K	7
111	Rosepine	B	79.2	7K	18
112	Moureauville	B	79.1	2K	13
113	Centerville	B	79	8K	14
114	Lisbon	B	78.9	891	11
115	Morgan City	B	78.5	15K	43
116	Grosse Tete	B	78.5	954	11
117	Marksville	B	78.2	18K	41
118	Estherwood	B	77.5	891	13
119	Denham Springs	B	75.6	100K	42
120	Goldonna	B	75.4	969	20
121	Franklinton	B	75.3	8K	77
122	Trout	B-	74.8	3K	12
123	Westwego	B-	74.7	9K	55
124	Oberlin	B-	74.7	6K	44
125	Port Allen	B-	74.3	31K	46
126	Cameron	B-	74.3	2K	28
127	Vidalia	B-	74.2	6K	11
128	Simsboro	B-	74.2	4K	33
129	Haynesville	B-	74.1	5K	40
130	Kaplan	B-	74	6K	49
131	Tangipahoa	B-	74	748	45
132	Simmesport	B-	73.7	2K	14
133	Hessmer	B-	73.5	3K	8
134	Monterey	B-	73.2	5K	8
135	Amelia	B-	73.2	3K	18
136	Patterson	B-	73	14K	19
137	Fordoche	B-	73	1K	8
138	Cheneyville	B-	72.6	2K	23
139	Loreauville	B-	72.5	10K	22
140	Gramercy	B-	72.5	3K	70
141	Pine Praire	B-	72.5	3K	10
142	Broussard	B-	72.2	20K	58
143	Delcambre	B-	72.2	2K	16
144	Glenmora	B-	72.1	4K	43
145	Cecilia	B-	71.5	12K	14
146	Mermentau	B-	71.2	780	20
147	Roseland	B-	70.9	2K	34
148	Eunice	B-	70.8	10K	33
149	Zachary	B-	70.7	32K	53
150	Morse	B-	70.3	806	19
151	Rosedale	B-	70.2	664	19
152	Cotton Valley	C+	69.6	1K	48
153	Greenwood	C+	69.3	5K	21
154	Leonville	C+	69.2	10K	31
155	Sunset	C+	69	11K	56
156	Kilbourne	C+	69	4K	33
157	Maurice	C+	68.5	28K	31
158	Madisonville	C+	66.3	2K	54
159	Mooringsport	C+	66.1	999	130
160	Rayne	C+	66	16K	43
161	Cottonport	C+	65.6	3K	22
162	New Llano	C+	65.2	9K	35
163	Sun	C	64.9	726	31
164	Ponchatoula	C	64.5	7K	30
165	Jonesville	C	64.2	7K	33
166	Amite	C	64	5K	39
167	Church Point	C	63.5	14K	23
168	Donaldsonville	C	63.3	12K	104
169	Clarks	C	63.2	906	17
170	Jeanerette	C	63	8K	64
171	Leesville	C	62.8	11K	52
172	Waterproof	C	61.6	786	85
173	Wilson	C	61.5	744	21
174	Arnaudville	C	61.2	9K	80
175	Mount Hermon	C	61	1K	15
176	Parks	C	60.9	13K	36
177	Arcadia	C	60.6	4K	40
178	Florien	C	60.3	700	16
179	Sarepta	C-	59.6	4K	38
180	Sibley	C-	59.6	2K	41
181	Youngsville	C-	59.2	19K	40
182	Olla	C-	58.1	3K	48
183	Scott	C-	58	10K	157
184	White Castle	C-	57.9	3K	18
185	Opelousas	C-	57.7	35K	56
186	Calhoun	C-	57.5	4K	60
187	Pollock	C-	56.9	7K	35
188	Wisner	C-	55.9	1K	29
189	Logansport	C-	55.5	2K	33
190	Duson	C-	55.4	19K	49
191	Plaquemine	C-	55.2	33K	42
192	Independence	D+	54.9	3K	53
193	Jena	D+	54.3	8K	64
194	Cullen	D+	52.7	1K	63
195	Laplace	D+	52.5	47K	142
196	Heflin	D+	52	2K	68
197	Many	D+	51.2	21K	372
198	Winnfield	D+	50.5	12K	244
199	West Monroe	D+	50.2	117K	658
200	Bernice	D+	50	8K	144
201	Dubach	D+	50	4K	164
202	Joyce	D+	50	840	154
203	Creole	D+	50	576	42
204	Greensburg	D	49.6	10K	23
205	Albany	D	49.5	12K	24
206	Bunkie	D	49	6K	38
207	Mamou	D	49	5K	38
208	Noble	D	49	549	77
209	Zwolle	D	48.2	12K	293
210	Grand Chenier	D	48.2	871	64
211	Choudrant	D	48	6K	86
212	Oak Grove	D	47.1	7K	52
213	Sicily Island	D	47.1	2K	45
214	Farmerville	D	47	12K	581
215	Harrisonburg	D	47	9K	181
216	Columbia	D	47	9K	78
217	Downsville	D	47	5K	225
218	Marion	D	47	4K	368
219	Provencal	D	47	3K	160
220	Castor	D	47	3K	189
221	Chatham	D	47	2K	104
222	Converse	D	47	2K	107
223	Clayton	D	47	2K	111
224	Dodson	D	47	1K	183
225	Tullos	D	47	792	124
226	Ridgecrest	D	47	684	79
227	Pleasant Hill	D	46.9	990	31
228	Palmetto	D	46.5	2K	45
229	Keithville	D	46.2	10K	174
230	Franklin	D	46.2	9K	152
231	Oil City	D	46	2K	147
232	Newellton	D	46	1K	170
233	Sterlington	D	46	1K	44
234	Clarence	D	46	642	59
235	Jonesboro	D	45.8	9K	185
236	Doyline	D	45.8	4K	198
237	Breaux Bridge	D	45.5	14K	60
238	New Roads	D	45.2	25K	80
239	Bogalusa	D	45	14K	56
240	Oakdale	D	45	10K	64
241	Grayson	D	45	4K	135
242	Belmont	D	45	3K	145
243	Elm Grove	D	45	2K	45
244	Hodge	D	45	1K	199
245	Bonita	D	45	1K	156
246	Eros	D	45	1K	128
247	Calvin	D	45	591	226
248	Kinder	F	44.5	11K	45
249	Prairieville	F	44.5	7K	154
250	Gibsland	F	44.3	1K	69
251	Pineville	F	44.2	25K	20
252	Westlake	F	44.2	10K	38
253	Homer	F	44.2	8K	84
254	Lake Charles	F	43.9	120K	369
255	Alexandria	F	43.9	69K	232
256	Minden	F	43.5	26K	194
257	Mansfield	F	43.5	19K	346
258	Baton Rouge	F	43.2	702K	90
259	Milton	F	43.2	13K	134
260	Alanta	F	43.2	3K	37
261	Pine Prairie	F	43.2	900	36
262	Belle Chasse	F	43	32K	166
263	Keatchie	F	43	4K	77
264	Plain Dealing	F	43	3K	117
265	Sikes	F	43	639	209
266	Mandeville	F	42.9	65K	578
267	Bastrop	F	42.9	25K	101
268	St Joseph	F	42.9	5K	106
269	Haughton	F	42.8	6K	41
270	Tallulah	F	42.2	12K	91
271	Grambling	F	42.2	12K	90
272	Ringgold	F	42	5K	165
273	Iota	F	42	2K	20
274	Loranger	F	42	2K	148
275	Springfield	F	42	695	66
276	Hammond	F	41.6	101K	187
277	Bossier City	F	41.2	80K	298
278	Monroe	F	41.1	65K	88
279	Ferriday	F	41	13K	377
280	Gilbert	F	41	11K	276
281	Winnsboro	F	41	9K	35
282	New Iberia	F	41	9K	60
283	Melville	F	41	2K	106
284	Bienville	F	41	1K	140
285	Epps	F	41	594	58
286	Covington	F	40.9	84K	273
287	Rayville	F	40.5	9K	306
288	St. Martinville	F	40.2	14K	138
289	Benton	F	40	33K	94
290	Coushatta	F	40	13K	436
291	Slidell	F	39.5	48K	396
292	Ville Platte	F	39.2	21K	112
293	Angie	F	39.2	10K	162
294	Lake Providence	F	39.2	7K	75
295	Transylvania	F	39.2	1K	103
296	Saline	F	39	3K	317
297	Egan	F	38.2	8K	67
298	Quitman	F	38	3K	82
299	Gueydan	F	38	2K	24
300	Montgomery	F	38	2K	65
301	Shreveport	F	36.5	202K	289
302	Colfax	F	36	4K	45
303	Dry Prong	F	36	3K	47
304	Collinston	F	36	1K	74
305	Lafayette	F	35.1	203K	130
306	New Orleans	F	34.1	388K	83
307	Kentwood	F	34	2K	185
308	Grand Coteau	F	34	2K	48
309	Campti	F	33	3K	129

Counties

Browse Louisiana counties

ZIP Codes

Browse Louisiana by ZIP code

Look up water quality by ZIP code to find the systems serving your area.

View all Louisiana ZIP codes →

FAQ

Frequently asked questions about Louisiana's water

Is Louisiana's tap water safe to drink?

Louisiana's water quality varies by city. The statewide average grade is C+ (65.5/100). 49% of cities scored an A or B, while 38% received a D or F. Check your specific city for detailed results.

Which Louisiana cities have the best water quality?

The top-rated cities are Dequincy (A+), Singer (A+), Lockport (A+). These cities scored highest based on violation history, lead levels, PFAS contamination, and regulatory compliance.

Which Louisiana cities have the worst water quality?

The lowest-rated cities are Campti (F), Grand Coteau (F), Kentwood (F). We recommend residents in these areas consider water filtration and review their city's specific contaminant data.

How many Louisiana cities have PFAS in their water?

141 out of 309 cities tested positive for PFAS "forever chemicals" (46%). 6 cities exceed the 2024 EPA maximum contaminant levels. Reverse osmosis or activated carbon filters can help reduce PFAS exposure.

Do any Louisiana cities have dangerous lead levels?

1 city exceeds the EPA lead action level of 15 ppb. Lead contamination typically comes from aging pipes and lead service lines rather than the water source itself. An NSF 53-certified filter can effectively remove lead from tap water.

Louisiana Water Quality Report