Walnut Creek Water Co.

Who runs it

EPA's record says Walnut Creek Water Co. has 425 service connections and serves 1,270 people.

EPA classes it as a community water system, one that serves the same residents all year.

Its office telephone on EPA's record is 330-763-3621.

Source: EPA Safe Drinking Water Information System (SDWIS), water system record.

How the water is treated

EPA's treatment table registers these steps for Walnut Creek Water Co.: aeration, chlorine disinfection, iron and manganese removal, and sand or media filtration.

The list is what each system registered with EPA for treatment plants EPA still shows as active, and it can lag a plant upgrade.

Source: EPA Safe Drinking Water Information System (SDWIS) treatment table (EPA Envirofacts, pulled September 2026).

Violations

EPA counts 1 health-based violation for Walnut Creek Water Co. since 2015. Health-based means a contaminant above its legal limit or a required treatment step not carried out. It falls into 1 separate problem (one contaminant or rule in one year); the table lists it.

EPA logs 4 violations of any kind since 2020: 3 for a report, record or notice that was missing, late or incomplete (the yearly water quality report, a public notice, lead line records); 1 health-based.

Source: EPA Safe Drinking Water Information System (SDWIS) violation records: health-based violations with compliance periods beginning in 2015 or later, all violations from 2020 or later (EPA Envirofacts, pulled September 2026).

Lead and copper at the tap

In the sampling period ending December 2023, the 90th-percentile lead result at Walnut Creek Water Co. was 1.6 ppb, under both the current 15 ppb action level and the 10 ppb level that applies from 2027.

The highest result on file is 1.8 ppb, in the period ending December 2020.

EPA has 3 sampling periods on file for Walnut Creek Water Co. since 2016, the first ending in 2017; no period was above 10 ppb.

Every water system has to inventory its service lines, the pipes from the main to each building. In the inventory Walnut Creek Water Co. sent EPA, 325 lines are counted.

Systems sample taps in the homes most likely to have lead pipes or solder. The 90th-percentile result is the level nine in ten of the sampled homes were at or below. Lead comes mostly from service lines and house plumbing, not the source water, so a low result for the system does not clear an old house.

EPA's dashboard status for this inventory: reported all required service line types.

Source: EPA Safe Drinking Water Information System (SDWIS) lead and copper 90th-percentile results (EPA Envirofacts), sampling periods ending 2016 or later; EPA's service line inventory dashboard, Ohio's 2026 Q2 submission.

PFAS

Ohio EPA's own statewide sampling tested 1 plant of Walnut Creek Water Co. (latest sample October 2020). Not one of the six PFAS tested (PFOA, PFOS, PFHxS, PFNA, GenX and PFBS) was detected.

Ohio EPA's current sampling status map lists 1 plant of Walnut Creek Water Co. as sampled, most recently April 2026.

PFAS are the 'forever chemicals' from firefighting foam, plating shops and non-stick coatings. Results are for water leaving the plant, not your tap.

Source: EPA UCMR 5 occurrence data (final release, August 2026); Ohio EPA statewide PFAS sampling, 2019 to 2021, and its sampling status map.

Disinfection byproducts

Chlorine that disinfects water also reacts with organic matter to form byproducts. Two groups have federal limits: total trihalomethanes (TTHM, 80 µg/L) and five haloacetic acids (HAA5, 60 µg/L), judged on running yearly averages at each sampling site.

For TTHM, the average of Walnut Creek Water Co.'s samples in 2019, the last year it was sampled, was 8.5 µg/L. The worst yearly average was 10.5 µg/L and the highest single sample was 13.8 µg/L, from 15 samples taken from 2012 to 2019.

For HAA5, the average in the last year sampled was 0 µg/L. The worst yearly average was 1.5 µg/L and the highest single sample was 1.5 µg/L, from 15 samples.

A yearly average of 0 means nothing was detected in that year's samples. EPA's file stops at 2019; Ohio EPA's Drinking Water Watch has newer results.

Source: EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, distribution-system samples (non-detects counted as zero).

Nitrate, arsenic and radioactivity

Nitrate: the highest of 10 samples was 0.86 mg/L (as nitrogen) in 2017; in 2019, the last year sampled, the highest was 0.49 mg/L. No sample was over the limit of 10 mg/L. Nitrate above 10 is unsafe for infants.

Arsenic was not detected in 4 samples (limit 10 µg/L).

Measured in finished water: at the plant's entry points and in the distribution system; raw well and intake samples are left out. Non-detects count as zero.

Source: EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, finished water.

Solvents and fuels

EPA's file holds results for all six solvent and fuel compounds it checked. Benzene, carbon tetrachloride, 1,2-dichloroethane, trichloroethylene, tetrachloroethylene, and vinyl chloride were not detected in 5 samples each.

"Not detected" means the lab's result was below what its method can measure, not that the compound is absent. Non-detects count as zero in the highest-result column.

Source: EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, finished water.

Farm chemicals and metals

EPA's file holds results for 8 of the nine herbicides and metals it checked. Detected: barium in 3 of 4 samples, highest 75.3 µg/L (limit 2,000). Not detected: atrazine, alachlor, chromium, cadmium, mercury, selenium, and thallium, in 4 samples each.

Non-detects count as zero in the highest-result column.

Source: EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, finished water.

Bacteria in the pipes

From 2012 to 2019, 6 of 200 routine total coliform samples taken in the distribution system at Walnut Creek Water Co. tested positive (3%); in 2019, the last year on file, 0 of 24 did. E. coli was never found in the 6 samples tested for it.

A positive coliform test is a warning sign, not a violation by itself. E. coli is a sign that human or animal waste may have reached the water. Coliform counts are routine samples only; E. coli counts include repeat samples.

Source: EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, distribution-system presence/absence tests for total coliform and E. coli.

Fluoride

The Ohio Department of Health's report to the CDC (My Water's Fluoride) says Walnut Creek Water Co. has fluoride from natural sources, but at a level below what is recommended for preventing tooth decay, and does not adjust it. The level it reports is 0.45 mg/L.

EPA's treatment table lists no fluoridation step at Walnut Creek Water Co.

Measured fluoride: 0.48 mg/L on average at the plant's entry points in 2018 (below the 0.7 mg/L target); samples ran from 0.35 to 0.48 mg/L across 4 samples in 2012 to 2019.

The recommended level for preventing tooth decay is 0.7 mg/L; the federal limit is 4 mg/L. The treatment list is what each system registered with EPA and can lag a plant upgrade.

Source: CDC My Water's Fluoride (fluoridation status as reported by the Ohio Department of Health, fetched September 2026); EPA Safe Drinking Water Information System (SDWIS) treatment table; EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, entry-point fluoride samples.

Water and sewer bills

Ohio EPA's 2023 rate survey puts the water bill at Walnut Creek Water Co. for a household using 5,000 gallons a month at $477 a year, about $40 a month.

The survey lists it as “Walnut Creek Water Company”. These are inside-city rates and annual bills at the use shown.

Source: Ohio EPA 2023 Sewer and Water Rate Survey (Ohio State University, May 2025).

How well the service area is mapped

EPA estimated the service area of Walnut Creek Water Co. with a computer model rather than drawing it from the utility's map, so its edges are approximate.

Source: EPA Service Area Boundaries; resident estimate by this atlas from ZIP-code overlap.