Arizona Water Quality — 271 Cities Tested

Latest water news in Arizona

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

Jun 1, 2026

Colorado River Heads Into Its Driest Year on Record as Arizona Cities Tighten Water Rules

Lake Mead and Lake Powell are near record lows, Arizona's CAP deliveries are cut, and Phoenix-area cities are on Stage 2 drought rules as 2026 talks stall.

Read full story →

May 7, 2026

Data Centers Are Drinking Your Water: How AI Cooling Strains Local Drinking Supplies

Google's data centers used 8.1B gallons in 2024. Loudoun County's grew 250% in four years. Inside the AI water bill — and what it means for your tap.

Read full story →

Analysis

Arizona water quality overview

Arizona's drinking water quality is fair overall, with an average score of 68.4 out of 100 across 271 cities tested. The median score is 73.1, serving a total population of 6,430,202 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 105 of 271 cities tested (39%). 18 cities exceed the 2024 EPA maximum contaminant levels. 3 cities have 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: 230 cities use groundwater while 41 draw from surface water such as rivers, lakes, and reservoirs.

Key Concerns

Issues to watch in Arizona

105 cities

PFAS Detected

39% of tested cities have PFAS in their water supply.

3 cities

Lead Exceedances

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

221 cities

Health Violations

118,364 total violations recorded, 271 with unresolved issues.

39 cities

Failing Systems

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

Contaminant Data

Explore contaminants in Arizona

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

More contaminants tested in Arizona

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

State context

10

Superfund sites in Arizona

EPA National Priorities List

57.7%

of Arizona residents on fluoridated water

CDC, 2020

1,901

lbs released to surface water

Top 10 TRI facilities, 2023

31.6%

of Arizona domestic wells exceed EPA arsenic limit

USGS, 1,608 samples · 10 µg/L MCL

Domestic well chemistry

Private-well water in Arizona

Based on USGS Powell Domestic-Well Database — 1,693 private wells sampled across Arizona. 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.

5.3 µg/L

Median arsenic in domestic wells

P90 32.0 µg/L · max 140.0 µg/L

10 µg/L

Median manganese in domestic wells

30.8% exceed 300 µg/L aesthetic limit

Industrial pollution

Top industrial water polluters in Arizona

Industrial polluters nearby

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

Total reported releases to surface water: 1,901 lbs

Facility	Top chemical	To surface water (lbs/yr)
NUCOR STEEL KINGMAN LLC Primary Metals · NUCOR CORP KINGMAN, AZ86413	Manganese And Manganese Compounds	847
HERMOSA Metal Mining · NA PATAGONIA, AZ85624	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	752
FREEPORT-MCMORAN MIAMI INC Primary Metals · FREEPORT-MCMORAN INC CLAYPOOL, AZ85532	Zinc compounds	291
FREEPORT-MCMORAN BAGDAD INC Metal Mining · FREEPORT-MCMORAN INC BAGDAD, AZ86321	Copper And Copper Compounds	5
STURM RUGER & CO INC Fabricated Metals · STURM RUGER & CO INC PRESCOTT, AZ86301	Chromium	3

+ 2 more facilities

Source: EPA Toxic Release Inventory (TRI) 2023

Test your own tap

Get your Arizona 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 Arizona cities scored

A: 86 B: 58 C: 23 D: 65 F: 39

Best Cities

Worst Cities

City Map

Water quality across Arizona

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

271 cities in Arizona

Full rankings →

#	City	Grade	Score	Population	Violations
1	Oracle	A+	95	11K	15
2	Brunswick	A	94.5	1K	6
3	Cove	A	94.5	728	41
4	Sr Boarding School, Sr Subdivision, Palo	A	94.3	2K	44
5	Munds Park	A	94.2	8K	47
6	Narbona Pass, Sheep Springs	A	94.2	862	47
7	Narbona Pass, Sheep Springs	A	94.2	862	47
8	Sells, Big Fields	A	93.8	4K	40
9	South Komelic, Choulic, Cold Fields, Top	A	93.7	1K	15
10	Rock Springs	A	93.5	2K	41
11	Rock Springs	A	93.5	2K	41
12	Hard Rock, Dinnebeto, Rocky Ridge	A	93.2	982	63
13	Tsa Yah Toh	A	93	865	66
14	Tsa Yah Toh	A	93	865	66
15	Newcomb	A	92.9	602	32
16	Newcomb	A	92.9	602	32
17	Crownpoint, Littlewater, Three Mile Poin	A	92.8	4K	70
18	Crownpoint, Littlewater, Three Mile Poin	A	92.8	4K	70
19	Silverbell	A	92.8	3K	39
20	Klagetoh, South Ganado, Wide Ruins	A	92.6	971	70
21	Sanostee, Tocito, Littlewater, Mittenroc	A	92.5	2K	80
22	Sanostee, Tocito, Littlewater, Mittenroc	A	92.5	2K	80
23	Torreon/Ojo Encino, New Mexico	A	92.5	2K	13
24	Torreon/Ojo Encino, New Mexico	A	92.5	2K	13
25	Oljeto	A	92.4	1K	34
26	Oljeto	A	92.4	1K	34
27	Tuba City	A	92.3	6K	57
28	Gap/Cedar Ridge/Bittersprings,Arizona	A	92.2	1K	86
29	Red Rock (South Of Gallup)	A	92	2K	38
30	Red Rock (South Of Gallup)	A	92	2K	38
31	Thoreau West Rural	A	92	2K	41
32	Thoreau West Rural	A	92	2K	41
33	Cottonwood, Tselani	A	92	1K	37
34	Huerfano	A	92	1K	70
35	Huerfano	A	92	1K	70
36	Leupp, Birdsprings, Tolani Lake	A	91.9	2K	25
37	Casamero Lake, Borrego Pass, Smith Lake	A	91.9	906	86
38	Casamero Lake, Borrego Pass, Smith Lake	A	91.9	906	86
39	Naschitti, Bisola	A	91.7	1K	91
40	Naschitti, Bisola	A	91.7	1K	91
41	Coyote Canyon, Brimhall, Bass Lake	A	91.7	622	51
42	Coyote Canyon, Brimhall, Bass Lake	A	91.7	622	51
43	Upper Cov Wells, Lower Cov Wells, Sikul	A	91.7	538	16
44	Tohatchi, Mexican Springs	A	91.6	2K	42
45	Tohatchi, Mexican Springs	A	91.6	2K	42
46	Le Chee	A	91.6	1K	77
47	Pinon, South Pinon, Burnt Corn, Blue Gap	A	91.5	5K	38
48	Shonto Junction	A	91.4	1K	36
49	Jeddito	A	91.4	1K	69
50	New Lands (Sanders)	A	91.3	2K	86
51	Bread Springs, Chichiltah	A	91.2	2K	56
52	Bread Springs, Chichiltah	A	91.2	2K	56
53	Iyanbito	A	91.2	797	97
54	Iyanbito	A	91.2	797	97
55	Tsaile, Dine College	A	91.1	1K	99
56	Twin Lakes, Toh-La-Kai, Black Springs Wa	A	90.9	2K	48
57	Twin Lakes, Toh-La-Kai, Black Springs Wa	A	90.9	2K	48
58	Inscription House, Broad Mesa West, Dry	A	90.9	1K	10
59	Gallup, West Of	A	90.8	2K	46
60	Gallup, West Of	A	90.8	2K	46
61	Nageezi	A	90.3	763	75
62	Carefree	A-	89.8	4K	36
63	Ojo Encino, North Of	A-	89.7	1K	74
64	Ojo Encino, North Of	A-	89.7	1K	74
65	Gisela	A-	89.3	508	85
66	Standing Rock	A-	89.1	739	77
67	Standing Rock	A-	89.1	739	77
68	San Manuel	A-	88.7	5K	30
69	Houck, Querino Canyon	A-	88.7	1K	15
70	Fruitland Park	A-	88.3	1K	10
71	Lukachukai	A-	88.1	2K	35
72	Crystal, Yazzie Springs, Crystal Junctio	A-	88.1	715	43
73	Crystal, Yazzie Springs, Crystal Junctio	A-	88.1	715	43
74	San Xavier West	A-	87.9	2K	46
75	Kykotsmovi	A-	87.6	1K	41
76	Vaya Chin, Hickiwan, San Simon Village/S	A-	87.5	1K	12
77	Spring Valley	A-	87.1	1K	135
78	Wilhoit	A-	87.1	880	37
79	Tuba City Bia Boarding School	A-	86.4	2K	29
80	Clints Well	A-	85.8	2K	77
81	Humboldt	A-	85.7	825	144
82	Seligman	A-	85.7	728	156
83	Sawmill (East And South), Upper Buell Pa	A-	85.6	838	17
84	Ak-Chin Village	A-	85.5	12K	43
85	Casa Blanca,Bapchule,Wet Camp,Sacate,Wes	A-	85.1	3K	50
86	Ganado, Cornfield, Steamboat, Woodspring	B+	85	4K	79
87	Bagdad	A-	85	3K	89
88	Patton Place Estates	B+	84.8	638	49
89	Mariano Lake, Pinedale, Churchrock	B+	84.5	5K	35
90	Mariano Lake, Pinedale, Churchrock	B+	84.5	5K	35
91	Pinon	B+	84.4	500	21
92	Shonto	B+	84.3	664	110
93	White Tanks	B+	84.2	19K	19
94	Upper Fruitland, Nenahnezad, San Juan, N	B+	84.2	15K	33
95	Upper Fruitland, Nenahnezad, San Juan, N	B+	84.2	15K	33
96	Chinle, Many Farms, Del Muerto	B+	84	8K	151
97	Stotonic, Goodyear, Gila Butte, Sweetwat	B+	84	3K	55
98	Circle City	B+	83.4	815	56
99	Sunsites	B+	83.3	1K	34
100	Chilchinbeto	B+	83.2	1K	105
101	Sun City West	B+	82.9	26K	103
102	Alpine	B+	82.7	1K	49
103	Yarnell	B+	82.7	515	123
104	Bacavi	B+	82.2	1K	52
105	Aguila	B+	81.9	987	113
106	Wildhorse Pass Casino, St. Johns Komatke	B+	81.8	23K	55
107	Cordes Lakes	B+	81.6	4K	89
108	Tolleson	B+	81.5	9K	112
109	Sunrise Vistas	B+	81.2	2K	50
110	Rio Verde	B+	80.5	5K	97
111	Clarkdale	B+	80.5	5K	100
112	Tonalea, Red Lake	B+	80.5	1K	106
113	Lynwood	B+	80.2	994	12
114	Paulden	B	79.9	2K	138
115	Organ Pipe Nm	B	79.7	755	53
116	Ash Fork	B	79.6	2K	89
117	Ft. Wingate High School	B	79.6	900	70
118	Ft. Wingate High School	B	79.6	900	70
119	Congress	B	79.5	2K	119
120	Pioneer	B	79.3	583	120
121	Lukachukai Community School New	B	78.7	500	8
122	Salt River Indian Community	B	78.4	21K	120
123	Anthem	B	78.1	24K	123
124	Sacaton, Sacaton Flats,Upper San Tan, Bl	B	78.1	5K	64
125	Peridot	B	78.1	2K	13
126	Miami	B	77.9	9K	194
127	Ehrenberg	B	77.1	989	196
128	Sun City	B	76.8	38K	296
129	Keams Canyon	B	76.8	925	194
130	Nazlini	B	76	862	179
131	Buckeye-Sono	B-	74.9	16K	114
132	Upper Moenkopi	B-	74.7	2K	312
133	White River	B-	74.1	622	284
134	Rock Point	B-	73.7	758	129
135	Middle Verde	B-	73.3	2K	161
136	Bourden Ranch Estates	B-	73.1	1K	56
137	Fort Defiance, Window Rock, St. Michaels	B-	72.6	13K	157
138	Centennial Park	B-	72.4	1K	202
139	Avra Valley	B-	72.4	900	229
140	Many Farms	B-	72	2K	144
141	Red Mesa	B-	72	1K	56
142	Dilcon, Indian Wells, Lower Greasewood,	B-	71.2	5K	102
143	Ajo	B-	70.6	3K	163
144	Cibecue	B-	70.5	3K	143
145	Joseph City	C+	69.7	2K	195
146	Lower Greasewood	C+	69.5	720	109
147	Kinlichee	C+	68.5	787	117
148	Sweetwater, Red Mesa	C+	68	2K	87
149	Dolan Springs	C+	67.3	2K	274
150	Avondale	C+	66	83K	218
151	Peach Springs	C+	65.7	5K	305
152	Patagonia	C+	65.6	842	177
153	Snowflake	C+	65.5	6K	193
154	Saint Johns	C+	65.5	4K	196
155	Eagar	C	64.7	5K	129
156	Rio Rico	C	62.1	18K	421
157	Topock	C	60.9	4K	315
158	Paradise Valley	C	60.8	14K	315
159	Naco	C-	59.8	658	112
160	Bellemont	C-	59.4	2K	86
161	Linden	C-	58.7	975	250
162	Superior	C-	58.1	4K	401
163	Mammoth	C-	57.8	1K	102
164	Cave Creek	C-	57.6	10K	311
165	Morenci	C-	57.6	4K	164
166	Adaman	C-	57.2	700	177
167	Fredonia	C-	55.1	1K	290
168	Aneth	D+	54.3	1K	131
169	Tempe	D+	53.8	165K	306
170	Red Rock	D+	53.5	4K	87
171	Supai	D+	53	885	413
172	Nageezi	D+	52.6	763	157
173	Quartzsite	D+	52.3	4K	460
174	Round Rock	D+	52.1	876	387
175	Hotevilla, Hotevilla/Bacavi Community Sc	D+	51.1	2K	110
176	Williams	D+	50	5K	266
177	Chino Valley	D+	50	3K	830
178	Shungopavi	D+	50	2K	378
179	Tusayan	D+	50	2K	659
180	Clifton	D+	50	2K	427
181	St David	D+	50	1K	313
182	Hopi High School	D+	50	1K	234
183	Pomerene	D+	50	1K	185
184	Lakeside	D+	50	999	863
185	Oro Valley	D	49	47K	1930
186	Tombstone	D	49	2K	703
187	Red Mesa	D	49	1K	448
188	Grand Canyon	D	48.7	17K	277
189	Toadlena, Two Grey Hills	D	48.2	903	143
190	Toadlena, Two Grey Hills	D	48.2	903	143
191	Bylas	D	48	3K	424
192	Tacna	D	48	500	706
193	Eloy	D	47.2	17K	781
194	First Mesa Consolidated Villages	D	47.2	4K	376
195	Willcox	D	47.2	3K	235
196	Ganado	D	47.2	1K	453
197	Johnson Ranch	D	47.1	87K	297
198	Sierra Vista	D	47	37K	4776
199	Winslow	D	47	10K	490
200	Taylor	D	47	4K	307
201	Kearny	D	47	2K	711
202	White Mountain Lakes	D	47	2K	285
203	Huachuca City	D	47	940	407
204	Hayden	D	47	577	253
205	San Luis	D	46.8	40K	628
206	Whiteriver	D	46.8	19K	339
207	Benson	D	46.8	6K	517
208	Lake Havasu City	D	46.6	55K	514
209	Wellton	D	46.4	3K	453
210	Green Valley	D	46.2	22K	1175
211	Kayenta	D	46.2	500	311
212	El Mirage	D	46	40K	835
213	Big River	D	46	4K	236
214	Big River	D	46	4K	236
215	Aneth	D	46	1K	149
216	Cameron	D	46	1K	272
217	Elfrida	D	46	800	260
218	Prescott Valley	D	46	732	442
219	Douglas	D	45.9	17K	1376
220	Pinetop	D	45.8	10K	1037
221	Queen Creek	D	45.7	96K	551
222	Maricopa	D	45.6	89K	1389
223	Kingman	D	45.5	49K	1552
224	Somerton	D	45.5	16K	473
225	Cottonwood	D	45.4	20K	1704
226	Show Low	D	45.4	18K	1380
227	Flagstaff	D	45.3	93K	2244
228	Safford	D	45.2	22K	750
229	San Carlos	D	45.2	11K	2043
230	Camp Verde	D	45.2	8K	1489
231	Catalina	D	45.1	18K	1027
232	Bisbee	F	45	9K	382
233	Bonita	D	45	800	937
234	Surprise	F	44.9	65K	966
235	Holbrook	F	44.1	5K	333
236	Goodyear	F	44	50K	359
237	Fort Huachuca	F	44	16K	836
238	Buckeye	F	43.8	67K	1892
239	Fountain Hills	F	43.5	7K	494
240	Apache Junction	F	43.3	16K	713
241	Parker	F	43.2	12K	1934
242	Wickenburg	F	43.2	10K	597
243	Scottsdale	F	43	244K	1262
244	Cornville	F	43	2K	322
245	Springerville	F	43	2K	560
246	Fort Defiance	F	43	875	176
247	Duncan	F	43	747	370
248	Nogales	F	42.8	23K	1938
249	Peoria	F	42.3	194K	2366
250	Marana	F	42.2	19K	923
251	Glendale	F	42.2	9K	1036
252	Pine	F	41.8	8K	1014
253	Sedona	F	41.5	10K	1929
254	Globe	F	41.2	8K	1634
255	Mesa	F	40.6	466K	1579
256	Litchfield Park	F	40.6	51K	927
257	Chandler	F	40.5	250K	1179
258	Page	F	40.2	12K	499
259	Mohave Valley	F	40.2	3K	261
260	Sahuarita	F	40	19K	798
261	Bullhead City	F	39.8	47K	3538
262	Heber	F	38.2	1K	418
263	Tucson	F	38.1	852K	11665
264	Phoenix	F	37.5	1.7M	1269
265	Prescott	F	37.5	46K	1912
266	Yuma	F	36.1	155K	4943
267	Gilbert	F	34.8	248K	1070
268	Payson	F	34	25K	3557
269	Florence	F	34	17K	1427
270	Black Canyon City	F	30	2K	510
271	Pima	F	29	5K	324

Counties

Browse Arizona counties

Apache 4 cities · avg 64 Cochise 13 cities · avg 50.8 Coconino 11 cities · avg 56 Cook 1 city · avg 80.2 Cumberland 1 city · avg 94.5 Gila 6 cities · avg 55.2 Graham 3 cities · avg 39.7 Greenlee 3 cities · avg 50.2 La Paz 3 cities · avg 57.5 Lake 1 city · avg 88.3 Maricopa 32 cities · avg 59.6 Mohave 8 cities · avg 56.7 Navajo 12 cities · avg 52.6 Pima 9 cities · avg 59 Pinal 12 cities · avg 55.2 Rio Arriba 1 city · avg 52.6 Santa Cruz 3 cities · avg 56.8 Yavapai 19 cities · avg 67.6 Yuma 5 cities · avg 44.6

ZIP Codes

Browse Arizona by ZIP code

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

View all Arizona ZIP codes →

FAQ

Frequently asked questions about Arizona's water

Is Arizona's tap water safe to drink?

Arizona's water quality varies by city. The statewide average grade is C+ (68.4/100). 53% of cities scored an A or B, while 38% received a D or F. Check your specific city for detailed results.

Which Arizona cities have the best water quality?

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

Which Arizona cities have the worst water quality?

The lowest-rated cities are Pima (F), Black Canyon City (F), Florence (F). We recommend residents in these areas consider water filtration and review their city's specific contaminant data.

How many Arizona cities have PFAS in their water?

105 out of 271 cities tested positive for PFAS "forever chemicals" (39%). 18 cities exceed the 2024 EPA maximum contaminant levels. Reverse osmosis or activated carbon filters can help reduce PFAS exposure.

Do any Arizona cities have dangerous lead levels?

3 cities exceed 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.

Arizona Water Quality Report