Neighborhood Report Grade C

Boulder, CO Neighborhood Water Quality - Grade C

Name: Water Quality Data for Boulder, Colorado
Creator: ZipCheckup
License: https://creativecommons.org/licenses/by/4.0/

16 ZIP codes · 192 EPA violations

Data source: EPA SDWIS Last verified: 2026-07-19

ZipCheckup compares 16 ZIP codes across Boulder, CO. The area averages a grade C (62/100); 16 ZIP codes carry recorded EPA violations.

Water quality varies significantly across Boulder, CO. We analyzed 16 ZIP codes to help you compare neighborhoods by water safety, lead risk, and EPA compliance.

City Overview: Grade C (62/100)

Grade	Neighborhoods	%
A	0	0%
B	0	0%
C	13	81%
D	3	19%
F	0	0%

Neighborhood Rankings

Every ZIP code in Boulder ranked by Home Safety Score:

Rank	ZIP Code	Score	Grade	Violations	Lead Risk
1	80306	68	C	12	0.0020 mg/L
2	80308	68	C	12	0.0020 mg/L
3	80307	64	C	12	0.0020 mg/L
4	80309	64	C	12	0.0020 mg/L
5	80310	64	C	12	0.0020 mg/L
6	80314	64	C	12	0.0020 mg/L
7	80321	64	C	12	0.0020 mg/L
8	80322	64	C	12	0.0020 mg/L
9	80323	64	C	12	0.0020 mg/L
10	80328	64	C	12	0.0020 mg/L
11	80329	64	C	12	0.0020 mg/L
12	80301	58	C	12	0.0020 mg/L
13	80305	58	C	12	0.0020 mg/L
14	80302	53	D	12	0.0020 mg/L
15	80303	53	D	12	0.0020 mg/L
16	80304	53	D	12	0.0020 mg/L

How Neighborhoods Compare

Each ZIP code compared to county and state averages:

11 neighborhoods score better than county average
5 neighborhoods score worse than county average

EPA Violations

192 total violations across Boulder
32 health-based violations
16 of 16 ZIP codes have violations
0 ZIP codes exceed EPA lead action level

Top Contaminants

Contaminant	Violations	ZIPs
Lead and Copper Rule	96	16
Surface Water Treatment Rule	32	16
Chlorine residual	32	16
E. coli	16	16
Fecal Coliform	16	16

Frequently Asked Questions

What is the safest neighborhood in Boulder?

ZIP code 80306 has the highest safety score in Boulder at 68/100 (grade C). Check the full report for details.

Is Boulder water safe to drink?

Boulder has an average water safety score of 62/100 (C). Water quality varies by neighborhood — no ZIP codes currently exceed EPA lead limits. Always check your specific ZIP code.

Data Sources

EPA SDWIS
U.S. Census Bureau

Updated daily.

How to cite this page

APA ZipCheckup. (2026). Boulder, CO Neighborhood Water Quality - Grade C. https://zipcheckup.com/neighborhoods/co/boulder/

BibTeX

@misc{zipcheckup-neighborhoods-co-boulder,
  author = {{ZipCheckup}},
  title  = {{Boulder, CO Neighborhood Water Quality - Grade C}},
  year   = {2026},
  url    = {https://zipcheckup.com/neighborhoods/co/boulder/}
}

Data as of July 2026.