How many water violations are in Dubuque County?

Dubuque County has 5,981 total drinking water violations across 75 water systems, of which 1,308 are health-based violations. 96.0% of systems have at least one violation.

How many people get water from Dubuque County systems?

Water systems in Dubuque County serve approximately 92,945 people through 75 public water systems.

Has PFAS been detected in Dubuque County water?

Under EPA UCMR5, 1 of 3 tested systems in Dubuque County had at least one PFAS detection (33.3% of the UCMR5-tested subset - not of all 75 SDWIS systems).

What types of water sources supply Dubuque County?

Water systems in Dubuque County use GW (75 systems) as their primary water sources.

Are health-based violations serious?

Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 21.9% of Dubuque County's violations are health-based. Among counties with any SDWIS violations, this extract puts Dubuque County in the middle health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

Where does Dubuque County sit among U.S. counties for water-system population?

According to EPA SDWIS county population served used on /counties, Dubuque County ranks #608 of 3,254 counties by people served, and #8 of 99 counties in Iowa. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Iowa

Dubuque County, Iowa

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet IA061 · Dubuque County 75 sys · 5,981 viol · #608/3254

VIOL-SEVERE · HEALTH-MID · RANK-TOP · PHOTO-FINISH · PFAS-MID · SRC-GW · SYS-MID · BOOK-FULL

VIOL-SEVERE 96.0% flagged
HEALTH-MID 21.9% health
RANK-TOP #608/3254
PHOTO-FINISH ±0.0 pp
PFAS-MID 33.3% detect
SRC-GW GW lead 100%
SYS-MID 75 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Johnson County (+ 0 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Dubuque County ranks #608 of 3,254 counties by people served, and #8 of 99 counties in Iowa. See methodology · corpus placement.

Dubuque County standing, mid-flagged corpus third

Flagged-system rate 96.0% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 21.9% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 33.3% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #608 of 3,254 · #8 of 99 in Iowa.

Water Systems

System Name	Population	Violations	PFAS
Dubuque Water Works	59,667	25	Detected
Asbury Municipal Water System	5,943	0	Clean
Dyersville Municipal Water Co	4,477	268	Clean
John Deere Dubuque Works	3,000	11	-
Cascade Municipal Water Supply	2,386	46	-
Peosta Water Supply	2,278	65	-
Epworth Water Supply	2,023	44	-
Farley Water Supply	1,766	73	-
Alpine Park	932	0	-
Hwy 20 Auto/Truck Plaza	912	20	-
Sun Down Ski Resort	685	29	-
Terrace Heights	548	32	-
Table Mound Park	455	62	-
Dubuque Sports Complex	400	194	-
New Vienna Water Supply	382	33	-
Worthington Water Supply	382	14	-
Swiss Valley Nature Center	363	55	-
Holy Cross Water Supply	356	66	-
Burds Green Acres Subdivision	312	45	-
Sageville Elementary School	310	66	-
Thunder Hills Home & Utility Assoc.	300	134	-
Fillmore Recreation Area	264	12	-
MUD Lake Park	257	8	-
Luxemburg Water Supply	245	8	-
Super 20 Mobile Home Court	236	81	-
Derby Grange Golf Inc	200	26	-
Saint Peter & Paul Parish - Sherril	200	100	-
Swiss Valley Park	183	21	-
Spring Valley Park	180	96	-
Town Clock	158	132	-
Breitbach Country Dining	150	67	-
Bankston Public Water System	145	110	-
Timberline Golf Course Inc.	130	300	-
Rolling Knolls Golf Course	118	306	-
Hickory Acres	115	53	-
Bernard Water System	114	9	-
Star Water	110	8	-
New Wine Park	105	85	-
Massey Marina	100	26	-
Tri-State Community Church	100	14	-
Heritage Trail	100	136	-
Lost Canyon MHP (Peosta)	97	70	-
Corporation of New Melleray	89	86	-
Dubuque Shooting Society	85	56	-
Rhodys	84	133	-
Riverview Ridge Campgrounds	80	16	-
Camp Granada	76	73	-
Offside Bar & Grill	75	2	-
Quality Water, Inc. #2 (K-L)	70	133	-
Lore Mound Mobile Home Park	68	56	-

Compare beyond Iowa

Mid-flagged peers for Dubuque County

Cross-state counties nearest Dubuque County on flagged-system share (96.0%) and cumulative violation count (5,981). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Compiled by PlainWater, Drinking Water Quality Editorial Process · May 15, 2026

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.