Water system
Williamsburg Village
EPA ID OH1301411 · Clermont County · 2,490 people served · owned by a local government
Williamsburg Village buys its water from Clermont Public Water System.
The system's record
- Aquifer
- Little Miami River Aquifer; Ohio River Valley Aquifer
- Water bodies
- William H. Harsha Lake (East Fork Lake), East Fork Little Miami River, Little Miami River, Ohio River
- Raw intakes
- Clermont Co Bmwt Fork Littl
- Active wells
- 24
- Serves
- 133,059 people · Clermont County
- EPA ID
- OH1302212
About this area's water
Did you know
- Williamsburg takes its drinking water from Clermont County through two separate physical cross-connections, on SR 276 and Old SR 32, rather than a single feed.
- Its emergency backup is a tie to a different county's rural water association - Brown County Rural Water, which pumps from 13 wells in the Ohio River Valley Aquifer - so the fallback supply is groundwater rather than…
- The village claims the oldest standing structure in Clermont County: an early-1800s stone dairy house at Harmony Hill, 299 South Third Street.
- Williamsburg buys every gallon it drinks but treats its own sewage at a village-owned wastewater plant.
- The village was founded in 1796 by General William Lytle and named for Williamsburg, Virginia.
Source: williamsburgohio.orgwilliamsburgohio.orgen.wikipedia.org
History4
- 1796Village founded by General William Lytle of Cincinnati and named for Williamsburg, Virginia.
- early 1800sStone dairy house at Harmony Hill, 299 South Third Street, built; the village describes it as the oldest standing structure in Clermont County.
- undatedWilliamsburg served as the original county seat of Clermont County before the seat moved to Batavia.
- 2025CCR reports the village buys all its finished water in bulk from Clermont County's Bob McEwen Water Treatment Plant through two cross-connections (State Route 276 and Old State Route 32), with an…
Source: williamsburgohio.orgen.wikipedia.orgwilliamsburgohio.org
Treatment & pressure
How it is treated
No drinking water treatment plant of its own. The village buys finished water from Clermont County's Bob McEwen Water Treatment Plant (Clermont County PWSID 1302212), which treats surface water drawn from William H. Harsha Lake on the East Fork Little Miami River using granular activated carbon…
Source: williamsburgohio.orgwilliamsburgohio.org
Water pressure
Not published. Neither the 2025 CCR, the water/sewer rate page, nor the Public Works page states a system pressure or shows a pressure-zone map.
What it costs
$11.94 per 1,000 gallons
Typical household bill about $29 a month for water.
In-village residential: $28.54 minimum covering the first 3,000 gallons, then $11.94 per 1,000 gallons above that. Outside the village: $38.92 minimum per 3,000 gallons plus…
Source: williamsburgohio.org
Water quality & impurities8
| Contaminant | Level | Limit | Year |
|---|---|---|---|
| Total Trihalomethanes (TTHM) Village of Williamsburg's own distribution system; range 31.3-66.5 ppb. | 49.93 ppb | 80 ppb MCL | 2025 |
| Haloacetic Acids (HAA5) Village's own distribution system; range 13.9-39.0 ppb. By-product of chlorination at the county plant. | 25.7 ppb | 60 ppb MCL | 2025 |
| Total chlorine Village distribution system; range 0.24-1.92 ppm. | 1.24 ppm | MRDL 4 ppm | 2025 |
| Lead (90th percentile) 0 of 10 samples exceeded the action level; range <0.4-3.3 ppb. | 2.6 ppb | 15 ppb action… | 2025 |
| Copper (90th percentile) 0 of 10 samples exceeded the action level; range 0.003-0.109 ppm. | 0.071 ppm | 1.3 ppm action… | 2025 |
| Total Trihalomethanes (TTHM) - Clermont… Reported in the Clermont County table of the same CCR. This, not the village's 49.93 ppb, is the reading that sits… | 73.32 ppb | 80 ppb MCL | 2025 |
| Nitrate - Clermont County wholesale… Appears only in the Clermont County table; Williamsburg does not report its own nitrate result. Well under the MCL. | 1.32 ppm | 10 ppm MCL | 2025 |
| Fluoride - Clermont County wholesale… Appears only in the Clermont County table. Water additive plus natural source. | 0.99 ppm | 4 ppm MCL | 2025 |
Source: williamsburgohio.org
EPA compliance record
Lead at the tap: 90th-percentile result 2.6 ppb in 2025 (action level 15 ppb).
EPA health-based violations since 2015:
- 2021Total trihalomethanes (TTHM) · above the legal limit on average · measured 0.081 MG/L (limit 0.08 MG/L) · returned to compliance
3 violations of any kind logged since 2020: 2 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.
EPA compliance record · Clermont Public Water System (treats the water)
Lead at the tap: 90th-percentile result 2.1 ppb in 2023 (action level 15 ppb).
EPA health-based violations since 2015:
- 2018Total trihalomethanes (TTHM) · above the legal limit on average · measured 0.081 MG/L (limit 0.08 MG/L) · returned to compliance
2 violations of any kind logged since 2020: 1 for required testing that was missed or reported late; 1 for a report, record or notice that was missing, late or incomplete (the yearly water quality report, a public notice, lead line records).
Supply stress
Williamsburg has no source of its own. All routine supply is finished surface water from Clermont County's Harsha Lake / East Fork Little Miami River intake, reaching the village through just two cross-connections (SR 276 and Old SR 32). The published fallback is an emergency connection to Brown County Rural Water Association's Ohio…
Sewers
Sanitary
The village owns and operates its own wastewater treatment plant; the Public Works Supervisor is the operator in charge. Sewer rates are $31.92 minimum per 3,000 gallons plus $11.08 per 1,000 gallons over, with a $3,400 capacity/installation fee for single-family residential and a $25 inspection fee (plus a $1,517.95 special valve…
Storm
Public Works lists street maintenance among its duties but publishes no stormwater program, fee, or flooding history.
Sourcesverified
Compiled from the utility's own reports and public records, then independently re-checked against primary sources.
Main supplier in 1 ZIP code
Serves
Main water supplier in 1 ZIP code
- 45176 · Williamsburg41% of residents
Also present in 1 more ZIP code
- 45103 · Union Township and Batavia3% of residents
Population-weighted resident shares; a ZIP code can have more than one system on record. Recomputed from each ZIP's own system list, not from the map's cached footprint.
Buys from · Sells to
Williamsburg Village buys its water from Clermont Public Water System.
No other system is on record buying water from Williamsburg Village.
What the records show about Williamsburg Village
Who runs it
EPA's record describes Williamsburg Village as owned by a local government. It has 1,086 service connections and serves 2,490 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 513-724-6107.
Source: EPA Safe Drinking Water Information System (SDWIS), water system record.
How the water is treated
Williamsburg Village buys water that Clermont Public Water System treats first, so the steps that count are the seller's. EPA's treatment table registers these steps for Clermont Public Water System: aeration, corrosion control, chlorine dioxide, coagulation and settling, chlorine disinfection, iron and manganese removal, fluoridation, granular activated carbon, ion-exchange softening, 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 Williamsburg Village 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 3 violations of any kind since 2020: 2 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.
| Year | Contaminant or rule | Kind | Measured | Limit | Status in EPA's record |
|---|---|---|---|---|---|
| 2021 | Total trihalomethanes (TTHM) | above the legal limit on average | 0.081 mg/L | 0.08 mg/L | returned to compliance |
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 2025, the 90th-percentile lead result at Williamsburg Village was 2.6 ppb, under both the current 15 ppb action level and the 10 ppb level that applies from 2027.
EPA has 5 sampling periods on file for Williamsburg Village 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 Williamsburg Village sent EPA, 1,084 lines are counted.
| Material | Lines |
|---|---|
| Lead | 0 |
| Galvanized, needing replacement | 0 |
| Unknown material | 0 |
| Not lead | 1,084 |
| All lines | 1,084 |
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
The water Williamsburg Village buys is treated by Clermont Public Water System, so the results below are Clermont Public Water System's.
EPA's fifth national round of testing (UCMR 5) took 8 samples of the water entering the pipes of Clermont Public Water System in 2024 to 2025 and measured 29 PFAS.
The highest PFOA or PFOS result, 10.1 ng/L, is at or above the federal limit of 4 ng/L that EPA set in 2024. Systems have until 2029 to comply, and in May 2026 EPA proposed letting systems apply for two more years. One sample over the limit is not a violation: compliance is judged on a running annual average.
The highest PFAS results were PFOS 10.1 ng/L, PFPeA 3.3 ng/L, and PFBS 3.1 ng/L.
The highest PFOA or PFOS result was measured at MGS Treatment Plant.
Ohio EPA's own statewide sampling tested 3 plants of Clermont Public Water System (latest sample June 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 3 plants of Clermont Public Water System as sampled, most recently December 2025.
| Compound | Highest result | Federal limit |
|---|---|---|
| PFOA | not detected | 4 ng/L |
| PFOS | 10.1 ng/L | 4 ng/L |
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 Williamsburg Village's samples in 2019, the last year it was sampled, was 35.9 µg/L. The worst yearly average was 72.4 µg/L and the highest single sample was 117.5 µg/L, from 56 samples taken from 2012 to 2019.
For HAA5, the average in the last year sampled was 7.7 µg/L. The worst yearly average was 40.4 µg/L and the highest single sample was 57.3 µg/L, from 56 samples.
| Byproduct | Limit | Latest yearly average | Worst yearly average | Highest sample | Samples |
|---|---|---|---|---|---|
| TTHM | 80 µg/L | 35.9 µg/L (2019) | 72.4 µg/L | 117.5 µg/L | 56 |
| HAA5 | 60 µg/L | 7.7 µg/L | 40.4 µg/L | 57.3 µg/L | 56 |
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
The water Williamsburg Village buys is treated by Clermont Public Water System, so the results below are Clermont Public Water System's.
Nitrate: the highest of 173 samples was 4.35 mg/L (as nitrogen), in 2019, the last year sampled. No sample was over the limit of 10 mg/L. Nitrate above 10 is unsafe for infants.
Arsenic: the highest of 24 samples was 3.6 µg/L (limit 10); detections averaged 3.6; none over the limit.
| Contaminant | Samples | Highest result | Limit | Samples over limit |
|---|---|---|---|---|
| Nitrate (as nitrogen) | 173 | 4.35 mg/L | 10 mg/L | 0 |
| Arsenic | 24 | 3.6 µg/L | 10 µg/L | 0 |
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.
EPA's file lumps the entry-point samples of all 3 plants of Clermont Public Water System together, so a result over a limit may come from a plant that serves a different part of town.
Source: EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, finished water of Clermont Public Water System.
Solvents and fuels
The water Williamsburg Village buys is treated by Clermont Public Water System, so the results below are Clermont Public Water System's.
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 12 samples each.
| Compound | Limit | Samples | Detected in | Highest result | Samples over limit |
|---|---|---|---|---|---|
| Benzene | 5 µg/L | 12 | 0 of 12 | not detected | 0 |
| Carbon tetrachloride | 5 µg/L | 12 | 0 of 12 | not detected | 0 |
| 1,2-dichloroethane | 5 µg/L | 12 | 0 of 12 | not detected | 0 |
| Trichloroethylene (TCE) | 5 µg/L | 12 | 0 of 12 | not detected | 0 |
| Tetrachloroethylene (PCE) | 5 µg/L | 12 | 0 of 12 | not detected | 0 |
| Vinyl chloride | 2 µg/L | 12 | 0 of 12 | not detected | 0 |
"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 of Clermont Public Water System.
Farm chemicals and metals
The water Williamsburg Village buys is treated by Clermont Public Water System, so the results below are Clermont Public Water System's.
EPA's file holds results for 8 of the nine herbicides and metals it checked. Detected: atrazine in 3 of 23 samples, highest 2.8 µg/L (limit 3); barium in 19 of 24 samples, highest 49.1 µg/L (limit 2,000). Not detected: alachlor in 23 samples, chromium in 28 samples, cadmium in 28 samples, mercury in 24 samples, selenium in 24 samples, thallium in 24 samples.
| Substance | Kind | Limit | Samples | Detected in | Highest result | Samples over limit |
|---|---|---|---|---|---|---|
| Atrazine | Farm chemical | 3 µg/L | 23 | 3 of 23 | 2.8 µg/L | 0 |
| Alachlor | Farm chemical | 2 µg/L | 23 | 0 of 23 | not detected | 0 |
| Chromium | Metal | 100 µg/L | 28 | 0 of 28 | not detected | 0 |
| Cadmium | Metal | 5 µg/L | 28 | 0 of 28 | not detected | 0 |
| Barium | Metal | 2,000 µg/L | 24 | 19 of 24 | 49.1 µg/L | 0 |
| Mercury | Metal | 2 µg/L | 24 | 0 of 24 | not detected | 0 |
| Selenium | Metal | 50 µg/L | 24 | 0 of 24 | not detected | 0 |
| Thallium | Metal | 2 µg/L | 24 | 0 of 24 | not detected | 0 |
Non-detects count as zero in the highest-result column.
EPA's file lumps the entry-point samples of all 3 plants of Clermont Public Water System together, so a result over a limit may come from a plant that serves a different part of town.
Source: EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, finished water of Clermont Public Water System.
Bacteria in the pipes
From 2012 to 2019, 1 of 192 routine total coliform samples taken in the distribution system at Williamsburg Village tested positive (0.52%); in 2019, the last year on file, 0 of 24 did. E. coli was never found in the 3 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 Williamsburg Village buys its water from Brown County Rural Water, a system that adjusts the fluoride level to the recommended level for preventing tooth decay.
EPA's treatment table lists fluoridation among the steps at Clermont Public Water System, which treats the water Williamsburg Village buys.
Measured fluoride: 1.02 mg/L on average leaving the plants of Clermont Public Water System, which supplies Williamsburg Village, in 2019 (in the range dentists aim for); samples ran from 0.84 to 1.19 mg/L across 24 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.
Lithium
Lithium was not detected in 8 UCMR 5 samples at Clermont Public Water System, which supplies Williamsburg Village, last sampled in 2025 (the method reports from 9 µg/L).
Lithium is not regulated. EPA's draft health reference level is 10 µg/L, and it occurs naturally in deep groundwater, so well systems in the northwest run highest.
Source: EPA UCMR 5 occurrence data (final release, August 2026), samples from 2023 to 2025.
Algal toxins
The water Williamsburg Village buys is treated by Clermont Public Water System, so the results below are Clermont Public Water System's.
Ohio EPA tests for microcystin, a toxin that harmful algal blooms can release, in raw water at the intake and in treated water.
At the intake, microcystin was detected 30 times in 372 raw-water samples, across 5 bloom seasons (2017 to 2026); the highest raw-water result was 8.522 µg/L on July 20, 2021. The highest raw-water result since 2024 was 0.79 µg/L.
In treated water, microcystin was detected 1 time; the highest result was 0.28 µg/L (August 2026), below the 0.3 µg/L advisory level.
In all, 778 samples from 2016 to 2026, the latest on August 18, 2026.
| Water | Samples | Detections | Highest result |
|---|---|---|---|
| Raw water, at the intake | 372 | 30 | 8.522 µg/L |
| Treated water | 406 | 1 | 0.28 µg/L |
The ten-day advisory levels for treated water are 0.3 µg/L for children under six and 1.6 µg/L for everyone else. Any detection at the intake triggers more frequent testing until two clean weeks.
Source: Ohio EPA public water system harmful algal bloom monitoring, 2016 to present (HAB data, fetched September 2026).
How well the service area is mapped
EPA estimated the service area of Williamsburg Village with a computer model rather than drawing it from the utility's map, so its edges are approximate.
Counting the people who live in the ZIP codes it overlaps, this atlas estimates 4,598 residents are inside the boundary, 185% of the 2,490 people Williamsburg Village reports serving.
The resident count is an estimate from 2020 Census ZIP-code populations, not a count of customers.
Source: EPA Service Area Boundaries; resident estimate by this atlas from ZIP-code overlap.
Photograph
On the map
Show this system's territory on the map — 2 ZIP codes in all.
Sources
U.S. EPA SDWIS and Community Water System Service Area Boundaries (v3, 2026), Ohio EPA primacy data, 2020 census blocks: the system serving most residents, traced through purchases to the treating utility; Ohio EPA 2023 Sewer and Water Rate Survey (Ohio State, May 2025) for household bills; Ohio EPA DEFA loan awards since 2016 for the loans paragraph · EPA SDWIS · EPA service area boundaries · Ohio EPA drinking water · Ohio EPA rate survey
EPA's own record for this system: Enforcement and Compliance History report for OH1301411 (EPA ECHO).
Notable facts: williamsburgohio.org, williamsburgohio.org, en.wikipedia.org
History: williamsburgohio.org, en.wikipedia.org, williamsburgohio.org
Water quality: williamsburgohio.org
Water pressure: williamsburgohio.org, williamsburgohio.org
Rates: williamsburgohio.org
Sewers: williamsburgohio.org, williamsburgohio.org
Treatment: williamsburgohio.org, williamsburgohio.org
Supply stress: williamsburgohio.org, williamsburgohio.org
