SIDNEY, Ohio Tap Water Quality

21,085 people served · 2 water systems

Fair

SIDNEY, Ohio is a small city with 21,085 residents served by 2 public water systems. Water service covers ZIP code 45365.

SIDNEY has documented several EPA health-based violations in the last five years. Residents may want to review which contaminants triggered the exceedances and consider point-of-use filtration for sensitive uses.

EPA reporting identifies Total Trihalomethanes (TTHMs) among the regulated contaminants associated with SIDNEY's recent health-based violations. Each contaminant has different sources, health implications, and recommended mitigation steps — links to the full EPA reference for each are listed alongside the violation history below.

Last updated: 2026-05-18 · Source: EPA SDWIS

Location

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Centered on ZIP-code centroids of water systems serving this city.

ZIP Codes Served

45365

Health-Based Violations (Last 5 Years)

EPA Maximum Contaminant Level exceedances reported by water systems serving SIDNEY. Each entry explains the contaminant, the health risk, and recommended precautions, and links to a full guide.

Total Trihalomethanes (TTHMs)disinfectant

EPA Code 2950 · Maximum Contaminant Level Exceedance

violations

EPA Limit

0.08 mg/L

Last Reading

.088 MG/L

First Reported

Oct 2024

Most Recent

Oct 2024

What this violation means

Total Trihalomethanes (TTHMs) form when chlorine reacts with naturally occurring organic matter — leaves, soil, algae — in source water. They are among the most commonly reported violations because utilities pulling from surface water (rivers, lakes, reservoirs) struggle to balance disinfection with byproduct formation. Long-term exposure has been linked to bladder cancer and adverse pregnancy outcomes.

Recommended precautions

→Activated carbon filters (pitcher, faucet, or under-sink) effectively reduce TTHMs.
→Letting water sit uncovered allows TTHMs to off-gas — leave a pitcher in the fridge for several hours.
→Shower with the bathroom fan on; TTHMs can volatilize into the air during hot showers.
→Boiling reduces TTHMs through volatilization, but only after extended boiling.

Read the complete guide to Total Trihalomethanes (TTHMs)

Source: EPA Safe Drinking Water Information System (SDWIS). Health-based violations only. Older violations may have been resolved; check your utility's most recent Consumer Confidence Report for current status.

Water Systems Serving SIDNEY

OHIO LIVING DOROTHY LOVE PWS

PWSID: OH7500712

471 served

SIDNEY CITY PWS

PWSID: OH7501214

20,614 served

4 violations

What Can You Do?

✅ Request your utility's annual Consumer Confidence Report (CCR) — required by law.
✅ Use an NSF-certified water filter if violations involve lead, arsenic, or PFAS.
✅ Run cold water for 30 seconds before drinking if you have older plumbing (reduces lead).
✅ Check back monthly — we update data from the EPA every 30 days.

About this data

This overview reflects EPA SDWIS data published as of 2026-05-18. It covers active Community Water Systems (CWS) that exceeded federal Maximum Contaminant Levels during the past five-year EPA reporting window. For up-to-the-minute information, request a current Consumer Confidence Report from your utility, or review the EPA's public dashboard.

Frequently Asked Questions

Is SIDNEY, Ohio tap water safe to drink?▼

This city's water had several EPA violations in the last 5 years.

How many EPA violations does SIDNEY have?▼

SIDNEY has 4 EPA health-based water violations in the last 5 years across 2 water systems serving 21,085 people.

What contaminants have been found in SIDNEY water?▼

The following EPA-regulated contaminants have been detected: 2950. View details about each contaminant, health effects, and recommended precautions above in the violations table.

Should I use a water filter in SIDNEY?▼

Using an NSF-certified water filter is recommended if your area has violations involving lead, arsenic, or PFAS. For other contaminants, consult your local water utility. Check the annual Consumer Confidence Report (CCR) for detailed guidance.

What should I do if there are violations in SIDNEY?▼

Request your water utility's annual Consumer Confidence Report (CCR), which is required by the EPA. Follow the utility's guidance on boil water advisories. Run cold water for 30 seconds before drinking if you have older plumbing. Use an NSF-certified filter if needed based on your water system's violations.