B66/100
Lodi Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 5,096 residents · Wisconsin
What's In Lodi's Tap Water?
1
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.018 mg/L | 0.015 mg/L | Over Limit |
EPA Violation History
4
Violations (last 5yr)
2
Unresolved
3
Health-Related
TIER 2Unresolved
Other non-health-based violation
TIER 2Resolved
Treatment technique violation
When: October 17, 2024 – February 17, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved
Disinfection byproduct treatment technique failure
TIER 2Resolved
Other non-health-based violation
When: December 11, 2023 – October 9, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
LODI WATERWORKS
Population Served
3,146
Water Source
Groundwater
System ID
WI1110100
HARMONY GROVE SAN DIST
Population Served
1,950
Water Source
Groundwater
System ID
WI1110101
Frequently Asked Questions About Lodi Water
Is Lodi tap water safe to drink?
Lodi, Wisconsin tap water receives a grade of B (66/100), which is considered good. Out of 1 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 1 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Lodi's water?
Of the 1 contaminants tested in Lodi's water supply, the most notable include Lead (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Lodi have any water quality violations?
Yes, Lodi has 21 EPA violation(s) on record, with the most recent in 2024. Violation types include TT, Other, MR. 9 of these are health-based violations, which are the most serious category.
Do I need a water filter in Lodi?
Based on EPA data, using a water filter in Lodi is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Lodi's tap water come from?
Lodi's drinking water is sourced from groundwater and supplied by LODI WATERWORKS and 1 other water system(s). The system serves approximately 5,096 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Lodi's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Lodi's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Lodi's water compare to other cities in Wisconsin?
Lodi's water quality score of 66/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our Wisconsin state page to see how all cities in the state compare.
What should I do if I'm concerned about Lodi's water quality?
If you have concerns about Lodi's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (LODI WATERWORKS) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.