Public water system record
Lewis Water Supply
Serves Lewis, Cass County, IA · 357 people served
Federal records show 1 health-based violation and no monitoring/reporting issues for Lewis Water Supply in the last ten years. The most serious issue in this window was a resolved Nitrate violation.
System profile
- Health-based violations, last 10 years
- 1
- Resolved
- 1
- Unresolved
- 0
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 0
Key facts
- Lewis Water Supply draws water from 2 wells.
- Highest measured level in the last 10 years: Nitrate, 14 mg/L, federal limit 10 mg/L (1.4 times the limit), 2025.
- Record on file since 1978, with 6 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 8 unknown out of 229 service lines.
Check whether Lewis Water Supply serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Nitrate
Contaminant limit exceeded
Measured 14 mg/L, federal limit 10 mg/L (1.4 times the limit)
|
330 | Mar 1, 2025 | Resolved | Yes |
Full record since 1978
EPA's records for Lewis Water Supply go back to 1978. Before October 19, 2016 they list 6 health-based violations (4 resolved, 2 archived by EPA without a recorded fix) and 1 monitoring or reporting violation.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1970s | 1 | 0 |
| 1980s | 1 | 0 |
| 1990s | 3 | 1 |
| 2000s | 1 | 0 |
| 2020s | 1 | 0 |
Most recent health-based violation before October 19, 2016: Nitrate (acute), began June 2003, Resolved.
Show all 6 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Nitrate (acute)
Contaminant limit exceeded
|
Jun 1, 2003 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Sep 1, 1998 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 1993 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Jul 1, 1993 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Oct 1, 1981 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Dec 20, 1978 | Archived |
What the violations mean
Nitrate
1 incidentNitrate exceeded the federal limit
High nitrate is especially dangerous for infants under 6 months and can cause blue baby syndrome
Where the water comes from
Lewis Water Supply draws water from 2 wells.
Annual water quality report
Lewis Water Supply must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Lewis Water Supply for a copy.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Iowa.
Certified drinking water labs by state EPA guidance for private wells