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WaterSafeCheck

ZIP Code 55905 Water Quality Report

Rochester, MN · Olmsted County County

Safety Score
C

Water Safety Grade

Fair — Some compliance concerns

Health Violations

0

Total Violations

3

Lead Risk

N/A

Contaminants

0

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Active Water Quality Issues Detected

EPA records show 0 unresolved violation. Contact Rochester for current status.

About Tap Water in ZIP Code 55905

Tap water in ZIP code 55905 (Rochester, MN) receives a C grade (score: 58/100) based on EPA monitoring data. While the water from Rochester is treated and regulated, this area has a moderate violation history that residents should be aware of.

Water System

Rochester

EPA ID: MN1550010

Water Source

Ground Water

Population Served

123,624 residents

County

Olmsted County County, Minnesota

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Lead Levels in ZIP 55905

EPA action level: 15 ppb | Public health goal: 0 ppb

Lead Level: 7.0 ppb — Below Action Level

The 90th percentile lead level in 55905 is 7.0 ppb, below the EPA action level of 15 ppb but above what many health experts consider ideal. The CDC and EPA both affirm there is no safe level of lead exposure for children. Families with young children or pregnant women should consider a certified NSF/ANSI 53 water filter, and request lead testing of their home's tap water.
Lead Level (90th percentile)
7.00 ppb (0.007 mg/L)
Lead (Consumer Confidence Report)

From annual CCR filing

7 ppb
Lead Exposure Risk Rating
Unknown
Note: Lead levels above are the 90th percentile from EPA monitoring — meaning 90% of samples were at or below this level. Even "undetected" tap water lead doesn't account for lead leaching from home plumbing. If your home was built before 1986, individual tap testing is recommended.
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Violation History

Past 5 years — EPA SDWIS data

Rochester has recorded 3 violations, but none are health-based. Administrative or reporting violations don't directly indicate unsafe water, but they do signal gaps in documentation or monitoring procedures.

Total Violations (5 yr)
3
Health-Based Violations
0
Unresolved Violations
0
Boil Water Advisories
0
Compliance Risk
Moderate

Regulatory compliance risk is rated Moderate. Rochester has had occasional lapses in compliance but generally meets Safe Drinking Water Act requirements.

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Contaminants Detected

Contaminants with health-based violations on record

No health-based contaminant violations are on record for ZIP code 55905. This means EPA monitoring has not found levels of regulated contaminants exceeding the Maximum Contaminant Levels (MCLs) set under the Safe Drinking Water Act — a positive indicator of water quality compliance.

⚖ Enforcement Actions

9 enforcement actions have been issued against Rochester — a high number that reflects sustained compliance struggles. Enforcement actions escalate from administrative orders to financial penalties when utilities repeatedly fail to meet safe drinking water standards.
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Water Source & Environmental Factors

Ground Water

This system draws water from underground aquifers. Groundwater is naturally filtered through soil and rock, but can still contain naturally occurring minerals like arsenic, radium, or nitrates.

Water Source Type
Ground Water
CCR Source Classification
Ground Water
EPA Radon Zone

Highest potential

Zone 1

EPA Radon Zone 1 — highest potential for radon in indoor air. Homeowners should test their home for radon and consider mitigation if levels exceed 4 pCi/L.

🛡 What Should You Do? — ZIP 55905 Recommendations

  • ⚠ Use a certified NSF/ANSI 53 filter for drinking and cooking water if you have young children
  • ⚠ Never give unfiltered tap water to infants in formula — use certified bottled or filtered water
  • ⚠ Request a copy of the Consumer Confidence Report to see what was detected and when
  • ⚠ Call the EPA Safe Drinking Water Hotline: 1-800-426-4791

Frequently Asked Questions — ZIP 55905 Water Quality

Is tap water safe to drink in ZIP code 55905?+
Tap water in 55905 (Rochester, MN) is treated and regulated, but has a grade of C due to past violations. For most healthy adults, treated tap water is generally safe. Families with infants, young children, or immunocompromised individuals may want to use a certified water filter as a precaution.
What is the lead level in 55905 tap water?+
The 90th percentile lead level in 55905 is 7.0 ppb (parts per billion). The EPA action level is 15 ppb. This is below the action level, but some health experts recommend a lead filter for families with young children.
Who provides tap water to 55905?+
Tap water in ZIP code 55905 is provided by Rochester (EPA ID: MN1550010). This system serves approximately 123,624 residents. You can contact them directly for Consumer Confidence Reports, current advisories, and billing information.
What is the water source for 55905?+
ZIP code 55905 is served by ground water. Groundwater systems draw from underground aquifers. While naturally filtered, groundwater can still contain naturally occurring contaminants such as arsenic, radium, or nitrates at elevated levels in some regions.
Does 55905 have any active water quality violations?+
No active violations are on record for ZIP code 55905. EPA data shows this water system is currently in compliance with Safe Drinking Water Act standards.
How do I get a copy of my water quality report for 55905?+
Your water utility — Rochester — is required by law to send you an annual Consumer Confidence Report (CCR) by July 1 each year. You can also request it directly from the utility or find it online by searching "Rochester Consumer Confidence Report." The EPA's ECHO database also has historical compliance data.
What water filter should I use in 55905?+
The right filter depends on what contaminants are present. For lead, look for a filter certified to NSF/ANSI Standard 53. For chlorine byproducts (like THMs), NSF/ANSI 42 filters work well. For a broad range of contaminants including PFAS, look for NSF/ANSI 58 (reverse osmosis) systems. For ZIP code 55905, with a clean compliance record, a standard carbon block filter meeting NSF/ANSI 42 is a good choice for taste and as a precaution.
Is 55905 tap water safe for babies and infants?+
Infants are especially vulnerable to lead, nitrates, and microbial contaminants in drinking water. Given the detected lead level of 7.0 ppb in 55905, we recommend using a certified NSF/ANSI 53 water filter or certified bottled water for preparing infant formula. Always consult your pediatrician for guidance specific to your child's health.

Data Sources & Methodology

Water quality data for ZIP code 55905 is compiled from the EPA Safe Drinking Water Information System (SDWIS), EPA ECHO enforcement database, UCMR5 unregulated contaminant monitoring, and Consumer Confidence Reports filed by Rochester. Safety scores are composite metrics derived from violation history, lead levels, enforcement actions, and infrastructure risk indicators. Data reflects a 5-year monitoring window. Last dataset update: 2024. View EPA source data →